for me its defo Ocarina of time as a first of firsts!
then ofc the epic soundtracks of mass effect (especially during speeches in the first one) .. and the elevator music.
fallout 3 needs to be mentioned, but is cheating a bit, since most of its soundtrack isnt original. but its awesome anyway, and fits the setting (duuh)
portals. (hum along: this was a triumph...)
WoW has a great soundtrack, and i was like aargh this is awesome! and then i heard the score from AoC. Age of Conan has the best MMO score in my opinion.. its soo sweet: fits well with the setting and really gets you in the mood of killing people on mammoths.
i have to mention guitar hero .... well..
