Last year, the endlessly influential but often under-appreciated Big Star got a much-deserved rock-doc treatment when Nothing Can Hurt Me hit the festival circuit. And though the documentary won’t see its official release until July 3, the movie’s soundtrack — loaded with unreleased demos and unheard versions of the Memphis band’s most beloved songs — hits streets today.

The 22-track collection includes a new mix of a “September Gurls,” which you can hear exclusively here. Written and sung by the late Alex Chilton, the 1974 Radio City cut is considered by fans as one of Big Star’s best, and this unissued version proves them right.

Listen the alternate mix of “September Gurls” below:

The Nothing Can Hurt Me soundtrack can be purchased on vinyl or CD here.

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