Thats easy. Takashi Tateishi, Manami Matsumae, & Yoshihiro Sakaguchi - three of the members of capcom's Alph Lyla group - wrote the best soundtrack to any video game ever made. Mega Man 2.
http://www.youtube.com/watch?v=s7MiDyPEw_k
also if you dont know the minibosses, you should. but only if you like this sort of thing.
http://www.youtube.com/watch?v=EuxfQjJ-3DM