Published on May 4, 2012
GW2 lets you substitute in-game music playlists with your own. To do this:
1) Go to User/Documents/Guild Wars 2/Music
2) Make a playlist of the music you want to use and drag it in said folder along with the music files.
3) Name the playlist appropriately.
Supported playlist formats: .wpl .m3u .pls .asx .wax
Supported audio formats: .mp3 .ogg .flac .wav .aiff .midi .it (And more)
Feel free to replace boss fight music with Gone Guru and everything else with Skyrim music now.