I, as a seasoned and serious gamer, always say : good music makes people want to play a game. Blizzard
(and/or Black Isle) are definitely the leading names in this area. 3DO
, Electronic Arts
and some other companies are not bad too. I sometimes find myself installing Baldur's Gate, Monkey Island or Warcraft 3 Frozen Throne (Not to mention the constant joy of WoW addiction, arising from time to time) only to live the music and the atmosphere, despite the fact that these are games that I played hundreds of times/hours.
The other day, while listening to the Original Theme Music of Monkey Island 3 (Curse of Monkey Island, a legendary game and equally admirable work of Michael Land
), I extensively focused on this matter, why I constantly play particular games, especially older ones, and found that it's without doubt, the music. Fine music combined with the atmosphere of the game, becomes one with the gaming experience, having the greatest say in a game's quality.