Because it is CC0 and I love this, I made a C64 (Commodore 64)-like sounding version of "Boss Battle #2 ["8 bit"]" using nene's (https://opengameart.org/users/nene) MIDI file. The original page can be found here: https://opengameart.org/content/boss-battle-2-8-bit. I would like to put "No" in the "Is this you own work" section of the uploader, but no field appears for me to give proper credit.