In case anyone is interested in what I ended up using, see below. Basically
they follow the standard Mutopia statements with a line added that states the
modification that's been made. They both fit on two lines and links are
included in the PDFs.
Cheers,
-Paul
Creative Commons:
Sheet music from the Mutopia Project. Typeset using LilyPond by Nikos
Kouremenos (Mutopia-2014/03/24-519). Used under a Creative Commons
Attribution-ShareAlike 4.0 License. Modified: converted to Clairnote music
notation by Paul Morris. Free to distribute, modify, and perform.
Public Domain:
Sheet music from the Mutopia Project. Typeset using LilyPond by Steve Dunlop
(Mutopia-2008/01/13-1247). Placed in the public domain by the typesetter.
Modified: converted to Clairnote music notation by Paul Morris. Free to
distribute, modify, and perform.
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