I can't help but wonder why music from the Kirby franchise is so popular in Megaman hacks. Rock Man Exile, Rock Man Exhaust, Rockman 2 Min, several Megaman 5 hacks, etc. I feel like you could make an entire Megaman 2 hack sountrack using just Kirby related music that's been featured in Megaman hacks.
Besides Megaman, why is Kirby the most popular franchise to grab music from in Megaman hacks?