Music can have a visceral effect on us. Indeed, most people reading this will remember a time when music altered their mood — be that positively or negatively.

In the world of retail, manipulating mood can be the difference between a sale and someone walking out of the shop empty-handed.

Given humanity's readiness to be moulded by music, it comes as no surprise that stores and restaurants are incredibly interested in its potential to drive sales.

Playing music is a low-cost intervention that can be endlessly manipulated: from classical to jazz to death metal, and from barely audible to ear-splittingly loud.

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