The Grocery Store Music Trick That Quietly Inflates Your Bill Every Week

Slowing the music in a supermarket by switching from fast-paced tracks to slow ones pushed sales up by more than 38% in one of the most replicated experiments in retail science. That finding has been sitting in the academic record since 1982. Forty-plus years later, most shoppers have still never heard about it – and most grocery chains are counting on that.

The effect isn’t subtle, and it isn’t theoretical. When you walk into a store, and a slow, relaxed melody is drifting from the ceiling speakers, your shopping pace slows to match it. You spend more time in the aisles. You pick up more items. You leave having spent more money than you planned. The relationship between how music affects spending habits in a retail setting has now been studied across dozens of countries, store formats, and demographic groups, and the results keep pointing in the same direction. Background sound is doing something to your purchasing behavior that your conscious mind doesn’t register as influence.

What makes this particularly hard to defend against is that most shoppers simply don’t notice the music. Research going back decades has shown that ambient audio in stores operates below the threshold of conscious attention, shaping decisions while people remain focused on their list, their phone, or their budget. Understanding the mechanics of how this works doesn’t just satisfy curiosity – it gives you a concrete tool for managing what ends up in your cart.

The Tempo Effect: Why Slow Music Affects Spending Habits Most

The academic foundation for this field traces back to a study of supermarket shoppers conducted in the early 1980s, examining shopping behaviors across multiple U.S. cities. Researcher Ronald Milliman’s landmark work, published in what is now a foundational paper in the Journal of Marketing, found that music tempo variations significantly affect both the pace of in-store traffic and total dollar sales. The study recorded a 38.2% increase in sales simply by slowing the music tempo in a supermarket.

The mechanism isn’t mysterious. Music tempo affects time perception: faster music yields longer estimates of durations than slower pieces, whereas time is perceived as passing more quickly during the process of listening to faster music. According to a 2022 study in Acta Psychologica examining musical mode and tempo’s influence on time perception, these distortions in perceived duration are consistent and measurable across listeners. When people feel like they have more time, they browse more. When they browse more, they buy more.

Participants often associated pleasant or familiar music with slower pace, longer browsing times, and increased openness to make impulsive purchases. That combination – relaxed tempo, familiar sound, reduced time pressure – is exactly what a well-curated grocery store playlist is designed to create.

The Day of the Week Changes Everything

One of the more specific and recent findings in this area comes from a 2023 study published in the Journal of Marketing Research, authored by Carl-Philip Ahlbom and colleagues including Professor Jens Nordfält, co-director of the University of Bath’s Retail Lab. The research found that on weekends, music does not affect sales or perhaps even has a directionally negative effect compared with no music. On weekdays, playing music prompts a bump in sales of 11% for either type of music.

Weekday shoppers tend to be mentally tired, and music played in-store lifts their mood, making their decision-making more intuitive. With less scrutiny applied to purchases, people buy more products, treating themselves to additional items or upgrading the quality of planned purchases.

By Friday, as people head into the weekend, they are already feeling less depleted and music consequently loses its power. Over the weekend, shoppers are typically in a more positive frame of mind and in less of a rush, so music has very little impact on how much they purchase. Professor Jens Nordfält, co-director of the University of Bath’s Retail Lab, stated in an interview with Winsight Grocery Business that grocers can expect a roughly 11% boost in weekday sales revenue if they play light, lyric-free tunes.

The practical implication is simple: if you’re doing your grocery run on a Tuesday evening after work, you are measurably more susceptible to the audio environment than you would be on a Saturday morning.

Key, Volume, and the Match Between Music and Product

Tempo is only one dimension of the effect. The musical key – whether music is in a major key (typically brighter-sounding) or a minor key (typically more melancholic) – interacts with tempo to shape spending in ways that go beyond simple pacing. A study examining the interaction between tempo and mode found that music in a minor mode was significantly more effective at driving sales when accompanied by a slow tempo, producing greater increases than fast-tempo music in minor keys.

Volume is a separate variable with its own measurable outcome. Loud music causes shoppers to move faster through the store and spend less time browsing compared to softer music – which correlates directly with lower sales figures. A store with aggressive, high-volume music essentially accelerates the natural exit rate. Retailers who want to maximize dwell time – the amount of time a customer spends inside – need the volume low enough to feel ambient rather than intrusive.

According to an analysis of MRC data by Soundtrack Your Brand, 54.9% of people say they’ve stayed longer in a business because of the music, and 41% say they would spend more time and money if they liked the soundtrack. These are people who aren’t consciously focused on the music; they simply find the experience more pleasant and exit later than they otherwise would have.

What Gets Put in Your Cart Depends on the Beat

The type of purchase – not just the quantity – shifts based on music tempo. A 2023 study published in Frontiers in Psychology investigated the influence of background music tempo on consumer variety-seeking behavior. Five experiments revealed that background music tempo affects consumers’ variety-seeking behavior, with fast-tempo background music specifically increasing consumers’ variety-seeking. In that research, participants wore headphones and were randomly assigned to hear music that was either fast or slow while they completed decision-making tasks associated with purchasing items. Those listening to fast music were more likely to seek variety, while those listening to slow music were less likely to do so.

Slower music, by contrast, steers shoppers toward familiar, habitual purchases – but in greater volume. Fast-paced music encourages impulse buys of indulgent items, while slower tempos tend to result in higher produce and staple purchases. The practical upshot: the store playing slow music during weekday evenings may be engineering you toward both more spending and more considered choices, while a busier playlist during peak hours primes you for quick grabs and snack items.

This also extends to what kind of music is being played relative to the products on display. The classic demonstration comes from a British restaurant study by researchers Adrian North, Amber Shilcock, and David Hargreaves. Classical music, pop music, and no music were played in a British restaurant over the course of 18 evenings. The mean spend per head was calculated across starters, main courses, desserts, coffee, bar drinks, wine, and total spend. A MANOVA analysis revealed that there was an overall significant difference between the conditions, with classical music leading to higher spending than both no music and pop music. Shoppers exposed to classical music consistently spent more – not because their preferences changed but because the music primed a feeling of quality and elevated expectation. This 2003 study, published in Environment and Behavior, remains one of the clearest demonstrations of how genre, not just tempo, shapes what people spend.

Earlier work by North and colleagues, published in the Journal of Applied Psychology in 1999, showed that when familiar music was played in retail environments, products were evaluated more favorably – even when satisfaction wasn’t directly derived from the product itself. Recognizing a song creates a positive emotional response, and that glow transfers to everything in the immediate environment, including what’s on the shelf in front of you.

The Crowded Store Problem

There’s one notable context where the slow-is-more rule breaks down. In high-density shopping environments – stores that are genuinely packed with people – faster music can actually reduce stress and increase basket size more effectively than slower playlists. The explanation here is about crowd stress. When the store feels cramped and social density is high, a livelier tempo helps manage arousal levels and keeps shoppers from becoming irritable and leaving early.

This means retailers running a single static playlist are making a design error. The optimal audio strategy is dynamic: slower, quieter music during off-peak hours when the store is calm, and faster music during high-traffic windows when crowding becomes the dominant mood factor. Faster-paced tracks can create a sense of urgency and drive quicker decision-making, which in a packed store helps customer flow – but in a quiet store, it pushes people toward the exit faster than intended.

Read More: 9 Genius Ways to Outsmart Grocery Stores, Eat Healthy, and Save Money

The Scale of a Deliberate Industry

The commercial background music market built around this science is substantial. According to market research from Mordor Intelligence, the commercial background music market was valued at approximately $2 billion in 2026 and is growing at an annual rate of more than 6%. That growth is being driven almost entirely by retail and food service operators investing in audio environments as a measurable driver of sales. According to Soundtrack Your Brand’s latest survey, 95% of retail leaders treat music like a brand ambassador. When background music fits the brand, customers spend more time in the store.

Restaurants have applied this for decades, too. Slow music led customers to spend more time in the restaurant and to spend more money on alcohol. Caldwell and Hibbert also found that it led to more spending on food and beverages. A frequently cited body of work in this area, including Milliman’s 1986 restaurant study in the Journal of Consumer Research, established that slow-tempo music causes diners to linger longer and spend more overall – a finding that has since been replicated in multiple settings and countries. The tempo manipulation extends well beyond grocery aisles – any physical space where a commercial transaction is taking place is a candidate for this kind of audio influence.

For a closer look at how grocery stores use environmental psychology to shape your behavior at the checkout – not just in the aisles – this piece on why skipping self-checkout may actually be better for you is worth reading.

What to Do Now

The research is consistent enough that a few concrete adjustments can make a real difference to what ends up in your cart. The single most effective countermeasure is doing your main grocery shopping on the weekend rather than during weekday evenings, when mental fatigue makes you measurably more susceptible to in-store music. By Friday, shoppers are already feeling less depleted, and music loses much of its behavioral power. A Saturday morning trip is, in a very literal sense, more resistant to ambient audio manipulation than a Tuesday night run after work.

Shopping with a written list protects against the browsing behavior that slow music deliberately encourages. When your decision-making is anchored to a specific list, the extended dwell time that slow music produces doesn’t translate as efficiently into extra purchases. Use headphones with your own playlist if you want to fully neutralize the environmental tempo – this isn’t overkill; it’s directly countering the mechanism that research shows drives spending. Your own preferred music at your preferred tempo means the store’s audio no longer controls your pace. The effect is real, the investment required to exploit it is minimal, and most shoppers never think about it at all. Now you do.

AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.

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