Don't forget, we're still in need of MIDIs for the bosses, both versions of level 2, cutscenes, leitmotifs (Zelda, Lord Menace, King Dim etc.) more caves, and houses (fortune teller, witch's cave, shops etc.)
Also, I'm ready to replace any of the three Nintendo-property music tracks with not-so-copyright-protected songs, provided they are of comparable timbre.
Doublealso: rate my current selections of public domain music as detailed in the Music Tracker topic!