The document discusses the history and genres of indie music. It notes that in the mid-1980s, the term "indie" began to describe music produced on post-punk labels rather than just the labels themselves. This included college rock bands from the US and UK that rejected 1980s synthpop sounds. In the UK, a 1986 NME cassette helped define an indie pop scene. The term "indie rock" came to represent bands that remained dedicated to independence and didn't achieve mainstream success, often drawing on retro genres like garage rock. The document also lists examples of indie bands and subgenres like indie pop, indie rock, and indie electro.