How do I make music for CS?

[Tails Gamer]

I've been working on a mod of the classic Sonic R Tails for co-op for a few days now, and I want it to have custom music, but I've seen that it's in a file format called m64. How do I get it?

 

[theDuderAbide]

Convert a midi to one using m64tool (i think thats what it is called)