Homestuck has an awesome soundtrack and it's music is among my favourite. Some notable songs are:
http://homestuck.bandcamp.com/track/black-2
http://homestuck.bandcamp.com/track/sburban-jungle-2
http://homestuck.bandcamp.com/track/doctor-2
http://homestuck.bandcamp.com/track/descend
http://homestuck.bandcamp.com/track/dance-of-thorns
http://homestuck.bandcamp.com/track/at-the-price-of-oblivion
http://homestuck.bandcamp.com/track/derse-dreamers
http://homestuck.bandcamp.com/track/cascade <-- This one is the best
http://homestuck.bandcamp.com/track/song-of-skaia <-- It's a song in Latin and Tolkien Elvish
http://homestuck.bandcamp.com/track/black-2
http://homestuck.bandcamp.com/track/sburban-jungle-2
http://homestuck.bandcamp.com/track/doctor-2
http://homestuck.bandcamp.com/track/descend
http://homestuck.bandcamp.com/track/dance-of-thorns
http://homestuck.bandcamp.com/track/at-the-price-of-oblivion
http://homestuck.bandcamp.com/track/derse-dreamers
http://homestuck.bandcamp.com/track/cascade <-- This one is the best
http://homestuck.bandcamp.com/track/song-of-skaia <-- It's a song in Latin and Tolkien Elvish