Earlier quoted context omitted.
I used this. It worked fine. It's a shame it's necessary though... I wish there was some kind of vendor-neutral import/export format rather than requiring a third party to solve the whole matrix of integrations.
The music industry needs to more widely use some kind of equivalent to the ISBN that the book industry uses. A simple "ISMN" list per playlist/library would be all that would be needed to move between services when both apps have the same songs. One could also imagine a standardized ismn:// URL format that could open in your preferred music app, and this could work even without a streaming service if you already own…
https://en.wikipedia.org/wiki/International_Standard_Recordi...