World of Warcraft, City of Heroes, EverQuest II, Lineage 2, Lord of the Rings Online, Opinion, Star Trek Online, Ultima Online, LEGO Universe, Runes of Magic, Miscellaneous, Firefall, Jukebox Heroes, Music
A final reminder as to my self-imposed rules for this list: I limited myself to just one theme from a particular title, even if there were multiple themes in a game. Entries had to be a main theme or the closest equivalent of that; they had to be from MMOs, not from MOBAs; and I had to divorce my weighting of the track itself from the popularity of and my experience with that game. So there were no points added or subtracted based on my love of the game. I'm counting down the best music, period.
If you missed earlier parts of this series, check out themes #40-31, #30-21, and #20-11. Otherwise, hit that continue button and get listening already!