This San Fran group released its first tracks in the late '60s. But as rock was turning heavier and more grandiose, the Groovies held onto the music's fundamentals—Beatles-esque melody, Byrdsian shimmer, and Stonesy swagger—and became unlikely allies of punk's back-to-basics mission in the late ‘70s. The snarling, harmonica-honked “Teenage Head”, from 1971, provides a grainy snapshot of their primordial state as a raw rhythm ‘n' blues outfit. But with the urgently anthemic “Shake Some Action” and the jabbing guitar propulsion of “Between the Lines”, they minted a style of power-pop jangle that went straight for the jugular.