Well, I'm tired making Sonic 1 and Sonic 2 Zone-specific boss themes. Sonic 1 made it perfectly and not uploaded yet, but Sonic 2 struggling from repetive leitmotif. I tried to figure it out and just found THIS on my hard drive.
Download: https://www.youtube.com/watch?v=nZq9312zRkA
0:00 Intro (Sonic 3)
0:09 Sonic 3-fied Sonic 1 & 2 Theme
0:27 Sonic 3-fied Sonic and Knuckles Theme
0:43 Sonic 3-fied Sonic CD Theme but I forgor about pitch
0:49 Sonic 3-fied Sonic CD Theme
P.S.: Look mah, I've modded A.I.R. title screen