Atlantan-based chiptune artist RushJet1 has completely remade Mega Man 2's soundtrack with the power of the VRC6, Konami's super slick NES sound chip. With three additional channels, the chip brings out some seriously rich audio. For example, this is the original Heat Man theme, while this is the VRC6 remake.
The above video is a complete gameplay run of Mega Man 2 using the new soundtrack, but you can listen to or purchase it from Bandcamp as well. If you love Mega Man or chiptune music, it's worth checking out. I think you'll be pleasantly surprised.
Thanks to Tony Ponce for the tip!