Other formats?

[MarkGotham]

• Directly music21-y: I have a suitably tiny to tinyNotation converter (music21 was always focused on conversion in from tn). Would that be useful? If so, LMK where you'd like it and I’ll PR it. No pressure at all. Script here.
• Wider: You might also talk to @johentsch about possibly joining forces with his MS3 package for converting musescore.