I have heard many different arrangements and remixes of the Mega Man 2 score (which in my opinion is the best score of the original series) before, but this one is on a different level.
The pieces were arranged by Mark Polydoris, who slowed down the tempo of the songs, made other changes, and then played them on a piano. Here’s my personal favorite:
Would you play these for your baby? You can find the complete tracklist in the SoundClound links above and below.