When Donna Summer added prominent rock guitars to her sound, the results were uneven. For every “Hot Stuff” and “Cold Love,” there was a “Nightlife,” on which producers Giorgio Moroder and Pete Bellote abandon the experiment at the halfway point and revert to the pre-/post-disco motorik thud they invented.

This rejected track from the shelved I’m a Rainbow, which appeared on the Fast Times at Ridgemont HIgh soundtrack in 1982, is what I want from Summer rocking out. Eschewing Benatar-esque hysterics for a pace and timbre that presents her mid range in the most attractive setting, I can understand why her record company got the jitters.