In the first place has the value of the volume and the tempo. When the loud music sounds — shoppers spend in the store less time but spend more money. However, some buyers loud music so annoying that they immediately leave the store. So it's best when the music is loud, otherwise it is depressing. It is important to keep it muffled all sounds, clanking, drawing attention to himself, and quietly enveloped the buyer, made him feel comfortable and pleasant.