Im just gonna post the list of tracks i like the most from each mainline Sonic game. Please dont hate on me because i Like some tracks you dont,as its just my opinion:
Sonic 1:
-Scrap Brain Zone. Yeah,its a pretty good track for me,it did a pretty good job at being a final zone to Sonic 1.
Sonic CD:
-Cosmic Eternity (the ending cutscene vocal theme). Everytime im going to home by bus,i would get my headphones and Listen to this track.
Sonic 2:
-Hidden Palace Zone (unused). A relaxing,atmospheric theme that shuld have been used in Sonic 2.
Sonic 3 & Knuckles:
-Launch Base Zone Act 1 (Prototype). The prototype tracks for Launch Base are definetly better than the ones we have in the original AND the ones in Origins (make Jun Senoue stay away from making 16-Bit songs on Genesis Soundchip,hire someone who can re-do those tracks for Origins well and your good). The song does the job at being a track for the theme of Launch Base,instead of the MJ version.
Sonic Adventure 1:
-Open Your Heart. Its the song that brought Crush 40 into the Sonic series with style. I always go to listen to the track in SADX's Sound Test. This also got a Generations remix,but its not that great.
Sonic Adventure 2:
-Live and Learn. Another Crush 40 track,but equally as good as Open Your Heart. Its really Great,and there are multiple official remixes.
Sonic Heroes:
-Grand Metropolis. This track is the one like the most out of any song in Heroes,because it really gets me boppin'.
Sonic 06:
-Crisis City. Probably the best level in 06 for me (if im playing P-06 obviously) with a cool theme of city that never stops burning.
Sonic Unleashed:
-Endless Possibillities. This track is one of the reasons why Sonic Unleashed cant get remastered for current consoles because of this song's licensing issues. Overall,a pretty great track.
Sonic Colors:
Sorry,but i didnt play it,so i have no opinions for this one.
Sonic Generations:
-Sky Sanctuary Zone (Modern). A great remix of the best song in Sonic & Knuckles.
Sonic Lost World:
Didnt play this one either,nor do i plan to.
Sonic Mania:
-Press Garden Zone Act 1. A great theme of a newspaper factory (i think?).
Sonic Forces:
-Fist Bump. Forces is not the best at good songs,so i didnt really had another choices except this one.
Sonic Frontiers:
-Undefeatable. This is an overrated masterpiece,like i said before making this list.