EFF Open Audio License
IMSLP:EFF Open Audio License

This license is only to be applied to files from an external source which cannot be relicensed. This license predates CC BY-SA, which is its successor. For combined works, this license is considered compatible with CC-BY-SA, unless « only version 1.0 » has been specified, as CC-BY-SA versions are considered the succ
https://musique-libre.org/doc/eff-open-audio-license/
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