4. Friends - 'I'll Be There For You'
Friends was such an insanely popular show when it debuted in 1994 that radio DJs began looping the 40-second song and playing it as a regular song. The song was written by the producers of Friends, one of whom was married to a member of the Los Angeles power pop band the Rembrandts. They cut a short version of the song for the opening credits, and then expanded it into a full-length. The cast of Friends appeared in a video for the song, which reached Number 17 on the Billboard Hot 100. Needless to say, they never had another hit – but their song defines the 1990s in the same way that the Miami Vice theme defines the 1980s.