Led Zeppelin's debut album released 52 years ago

On January 12, 1969, the LP "Led Zeppelin" was released while the band was on tour. The run of live shows began in 1968 when the band was still being billed as The New Yardbirds. According to critic Steve Erlewine, the album's memorable guitar riffs, lumbering rhythms, psychedelic blues, groovy, bluesy shuffles and hints of English folk music made it "a significant turning point in the evolution of hard rock and heavy metal.