Bumping the thread so people can see this info, which may be valuable.
Of note, Marc Baril also said he put together a live band for some tracks, such as Homer's tuba and Lisa's sax tracks, but on other tracks the music was sequenced to save time. Some songs were reused between missions, again to save time. Mr. Baril also said he was the one who matched each song to its respective mission, and made the music "interactive" in some places based on the player's actions.
Jeff Tymoschuk was brought in to contribute three tracks, Professor Frink's theme, Dr. Nick's theme, and the Halloween theme. Allan Levy performed the rock-genre songs in the game, usually matched to Bart's missions.