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Very rare1.9%GrindOptionalAnywhere
You imported 10 or more songs via Trading Post or QR code into the game
When creating a song in the songs menu there will be a large QR code, take a picture of it with your cellphone/tablet/laptop. Then go to create a new song and hit back/select to open a QR scanner. Scan the code. Rinse & repeat 9 more times...