Mega Man 9: Back in Blue!
OC ReMix releases Mega Man 9: Back in Blue! "The album was organized by none other than Cave Story 3D musician Dustin "k-wix" Kulwicki, and it's all kinds of good. Along with the music, there's very cool visual art included as well. A feast for the eyes AND ears."
This album is free to download through these two methods: