Plato, the big-brained Greek philosopher, once wrote, “Music gives a soul to the universe, wings to the mind, flight to the imagination, and life to everything.” Oh, and it can also help sell jewelry.Numerous studies have proved that music has a profound effect on our mood, actions, and even physiological functioning—truisms retailers can harness to cultivate an in-store experience that encourages their clients to spend.A heavy, hard-driving beat, for example, can speed up a heart rate and inspire purchases. Classical music also inspires sales by imbuing the atmosphere with a general feel of affluence that magically loosens purse strings.But for many retailers, music is an afterthought at best. John Bradley, cofounder and chief music officer for CustomChannels.net, says many stores play the wrong music, adopting a “We’ve got music, let’s just use it” attitude. “That’s l