The glass shatters, the bell tolls, or a familiar riff hits-- everyone in the arena knows who is about to grace their presence. Entrance music is crucial to every wrestling superstar's career, many more than others. Since theme music was popularized in the 1980's, many careers were accelerated by something as simple as the music played when they walk down the aisle. Producers such as Jimmy Hart and Jim Johnston have made a career off of creating tunes for superstars, with Johnston even receiving his own DVD, "Signature Sounds" earlier this year. Does a great theme song make a great superstar, or vice versa? Is the wrestler responsible for popularizing the theme, or is the producer the brains behind the brawn? Either way, one of the most important aspects to a character is their signature theme music, which can make or break careers in some respects. An iconic theme is one recognizable even to those who aren't fans of wrestling, a song in which can be immediately be identified and connected with a name and a face. Who has the most iconic themes in wrestling history? Lets count them down.