No Chemical Zone?

You asked people to contribute but you are posting most of the soundtracks....

Anyways, 

Anything from sonic cd is a masterpiece.It was the musical peak of the series for me.And that's saying a lot.

Sonic Heroes has some of the best music from any of the Sonic games imo, it has so many classics. Most of my picks will be from Sonic Heroes just by itself.

Casino Park is probably one of my favorite themes from them all.

Just hearing some of these songs again is making me want to play Sonic Heroes again! if only they would release it on Steam eventually

I also love the Sonic Colors main theme, including the orchestra version of it during the final boss.

Sonic Forces has some good music as well, the main theme and the ending song especially.

Pretty much all of my music is sonic.

Almost anything from SA2

Lots of great Sonic songs. But I have two favorites.

Sonic 3 Ice Cap:

https://youtu.be/hYxlqTpZ-24

And Sonic 3D Blast (Saturn) Rusty Ruin Zone Act 2:

https://youtu.be/Wn2YxjPxnuk

Ohhhohohohohooo, you just got me going, my friend!!! Sonic, regardless of his ups and downs and all arounds, has always delivered in the music department. But if I'm gonna pick my absolute favorites: (And I put this list together as I listen to Stardust Speedway Act 1 from Sonic Mania. That track is just sex on the ears!)
Fasten your seatbelts, this is gonna be a loooong one!

Sonic 1:
- Green Hill Zone


- Spring Yard Zone


- Starlight Zone



Sonic 2:
- Emerald Hill Zone


- Chemical Plant Zone


- Mystic Cave Zone


- Metropolis Zone (But FUCK the badnicks in this zone, especially Slicers!)


- Death Egg 

Sonic 3 & Knuckles (MICHAEL JACKSON, MOTHERFUCKERS!!!) 
- Carnival Night Zone, Act 1 (Go with it! Go with it! JAM! It ain't too much to. JAM! It ain't too much. IT AIN'T TOO MUCH FOR ME!)


- Hydrocity Zone, Act 2 (Because I'M BAD! I'M BAD! C'MON! Really, really BAD! AND THE WHOLE WORLD HAS TO ANSWER RIGHT NOW. JUST TO TELL YOU ONCE AGAIN! Who's Bad?)


- IceCap Zone, Act 1 (Annie, are you ok? Annie, are you ok? Are you ok, Annie? YOU'VE BEEN HIT BY! (BANG-BANG) YOU'VE BEEN STRUCK BY! (BANG) A SMOOTH CRIMINAL!)

- Sonic 3 Staff Roll (How does it feel? How does it feel? How does it feel? When you're alone and you're cold inside... Like a STRANGER IN MOSCOW!)

Sonic Adventure:
- Open Your Heart (Main Theme)

- It Doesn't Matter (Sonic's Theme)

- Unknown from M.E. (Knuckles' Theme)

- Emerald Coast

- IceCap (Be Cool, Be Wild, Be Groovy!)

- Speed Highway

- Lost World (Tricky Maze)



Sonic Adventure 2 (This is where I REALLY start geeking out!)

- Live and Learn (Main Theme/Best Final Boss Theme EVER!)

- It Doesn't Matter Remix (Sonic's Theme, once again)

- Throw It All Away (Shadow's Theme)

- E.G.G.M.A.N. (Dr. Eggman's Theme)

- City Escape (Escape from the City. Better opening level than Green Hill. By Far.)

- Radical Highway (Vengeance Is Mine)

- Pyramid Cave (Keys The Ruin)

- Sonic vs. Shadow Boss Fight (For True Story)

Sonic Heroes (My First Sonic Game!!!)

- Sonic Heroes! (Main Theme, duh!)

- What I'm Made Of (Metal Overlord Boss Fight)

- We Can (Team Sonic Theme)

- This Machine (Team Dark Theme)

- Follow Me (Team Rose Theme)

- Team Chaotix (...you know)

- Seaside Hill

- Rail Canyon

- Frog Forest

Sonic the Hedgehog (2006) - The Music is the one saving grace of this game.

- His World (Main Theme)

- All Hail Shadow (Shadow's Theme)

- Dreams of an Absolution (Silver's Theme)

- Crisis City

- Kingdom Valley

Sonic Unleashed:

- Endless Possibilities (Main Theme)

- Windmill Isle (Apotos Day Stage)

- Rooftop Run (Spagonia Day Stage)

- Dragon Road (Chun-Nan Day Stage)

- Shamar Day

- Shamar Night (Awwwwwwwwwwwwwwwwwww... Excuse me while I change my pants.)

- Jungle Joyride (Adabat Day Stage)

I could go even longer than this. In case it wasn't obvious already, I love Sonic the Hedgehog.

I have fond memories of this song from Sonic CD:

Crush 40's cover ain't half-bad, either:

And speaking of Crush 40, I dig this song from Sonic Adventure 2: