Sonics had good music, although the later ones got less good...
Chrono Trigger had some good tracks and some bad ones...
Some of my favourites of all time were all the early LEC StarWars games, namely X-Wing, TIE Fighter and Dark Forces, espescially the later level tracks which were more original. The main reason is the iMuse system they used - *NO* game has even come close to the perfect integration and scoring they did there. They tried to duplicate it in X-Wing Alliance, but by that time LEC was on its decline and it shows.
Deus Ex and Freespace are the only other games tried to pull off iMuse-style dynamic music - Good tries, but the dynamicness is so basic and can't segue quickly enough compared to the original iMuse
Other scores that were pretty damned good off the top of my head:
Doom 1 and 2,
All LEC point'n'click games (Monkey Island, DOTT, etc.),
Most of the Unreal Tournament tracks
Prince of Persia: Sand of Time
Starcraft (Only the Terran tracks 'tho
Jets'n'Guns (These just ****ing rock)
From the oldsk00l bag, I'd say Bubble Bobble and New Zealand Story (Sickeningly cute
), Ace 2, All the Turricans, Cybernoid 2.