Rock music in the 1980s had completely lost the gritty feel of earlier eras, until Lenny Kravitz rediscovered the magic formula. Kravitz's sonic template combined good old-fashioned rock & roll with glam, soul, and psychedelia, making him a massive success. He made a splash straight out of the gate with his album Let Love Rule. After that, he de-emphasized the flower-power aspects of his music and began moving toward a heavier rock sound. This progression brought him such huge hits as "Are You Gonna Go My Way" and a hard-rocking cover of the Guess Who's "American Woman." Along...