Something I've figured out recently.
1. Masaru was responsible for Sonic Jam's music along with Kenichi Tokoi. Note the credit title "Compose & Arrange."
http://www.youtube.com/watch?v=SERdCIuiouo at 1:13
2. Among these tracks are a rearrangement of Sonic 3's Data Select Screen in Gallery, and the use of the same instruments and [almost the same] melody as Data Select Screen for Sonic World.
http://www.youtube.com/watch?v=7ocIpDz9zTM - Gallery
http://www.youtube.com/watch?v=VQiSqjjr3Ig - Sonic World
3. Kenichi Tokoi was not credited in Sonic 3, as Sonic Jam was one of his first games with Sega.
http://www.mobygames.com/developer/s...loperId,52518/
Therefore, Masaru Setsumaru composed Sonic 3's Data Select Screen.
Mini unofficial breakdown for Sonic Jam
Masaru Setsumaru: Opening, Sonic World, Gallery, Mission Start, Mission Finish 1, Mission Finish 2, Credits [Higher audio quality among all these] [Movies and extras]
Kenichi Tokoi: Game Select, Digital Manual, Time Attack, Best Lap, Result 1 [TA], Result 2 [TA] [Lower audio quality and shared instruments (i.e. Sax, which is also his distnguishing instrument in Sonic Adventure)] [Menus]
Be sure to check out my other Sonic 3 & Knuckes observations here:
http://vgmdb.net/forums/showthread.php?t=2067