This track how the SA2 version of Knuckles' theme should have been. :3

Unknown From M.E. ~KNUCKLES THE ECHIDNA THEME~ (TRUE SA2 REMIX)

It's Just So Bad

Knuckles' Theme, "Unknown From M.E." from Sonic Adventure

Sonic Adventure: Knuckles' Theme - Unknown From M.E.

Composed/Remixed by Tee Lopes for the Sonic Mania OST

Metallic Madness Zone Act 1 - Sonic Mania OST

Mecha sonic Theme remix Doomsday zone

Originally composed by Howard Drossin, this track has been remixed by Tee Lopes & Jun Senoue

It's was composed for Sonic Mania Adventures:
https://www.youtube.com/watch?v=-ueBs5bebyU

Theme of Knuckles - Sonic Mania Adventures Special Remix

Sonic CD Japan

Stardust Speedway: Bad Future

Sonic Generations Disc 1 (Genesis Era)

Metal Sonic

1-02 Sonic ~ You Can Do Anything

2-04 Stardust Speedway 'B' Mix JP

Sonic CD (Japan):Palmtree Panic (Bad Future)

WARNING - I DON'T EVEN OWN THE BATTLES, THEY'RE FROM THE ERB WIKIA. 
I just put them on YouTube, AND on Soundcloud.
I even made my own battles, but not all of them sucked.
I felt so retarded last time when I was editing pages.
So, now I've learned that you can edit your own pages, but not someone's else.
Most certainly, the reason why my mouth is in a gutter, it's because my dad was mentally ill.
He and my mother had a donut fight, and he lose.
The police kicked him out of the house, and he was put in jail.
My mother was working on an court plan.
[I'm such a major douchebag. -_-]

SO, ENJOY!

Unknown From M.E. ~KNUCKLES THE ECHIDNA THEME~ (TRUE SA2 REMIX)

Ccarbe6062