A final version with improved, more carefully edited choirs. I'll delete the old versions after a while.
The amazing art belongs to CorganArt on twitter, check out his work.
I wanted to capture a serious, somewhat divine atmosphere with this theme. Something that fleshed out Metal Sonic's power and determination, but also his own hope of beating Sonic.
Don't read this if you want to discover the included themes in the remix by yourself: aside from some original parts the remix features altered sections from Sonic 4's Metal Sonic theme; Stardust Speedway Bad Future (Japanese version); Never let it go from Sonic the Fighters; and What I'm Made Of.