Post-pandemic Broadway has gone into overdrive. This is the most promising season in years, one that’s especially rich in revivals — with a twist. The hottest new musical to watch for is “Almost Famous,” which starts previews Oct. 3 at the Bernard B. Jacobs. It’s drawn from Cameron Crowe’s 2000 movie, a semi-autobiographical take on his travels as a teenage reporter for Rolling Stone. The film introduced Kate Hudson as teeny-bopper Penny Lane, self-appointed muse for the band, and gave us a joyous rendition of “Tiny Dancer.” Hudson isn’t in the musical, but that Elton John song is. “That was...