5. The Keytar
As musician Susan Erwin proves in this picture, rocking a Keytar can look awesome! This unholy mashup between a keyboard and a guitar rocketed to fame in the 1970s and 1980s, though it's become more of a novelty item since then. If fads really do come and go in cycles, the keytar should be gearing up for its second run any day now, especially since it is the instrument-of-choice of Community's unhinged Senor Chang.