Blonde on Blonde’s second album, Rebirth, was a more focused body of music than their debut; it also constituted the recording debut of the group’s second lineup: David Thomas (vocals, guitar, bass), Gareth Johnson (sitar, lead guitar, lute, electronic effects), Richard Hopkins (bass, keyboards), and Les Hicks (drums, percussion). Whether they’re doing the spacy, airy, psychedelic pop of “Castles in the Sky” or the folky “Time Is Passing,” the group attack their instruments as though they’re performing live, and the effect is riveting throughout, even when the melodic content flags slightly. Thomas’ voice is powerful if a little over-dramatic at times, but when the band keeps things moving, there’s enough richness of content to carry the album and then some; the band was probably really interesting in concert, too, based on the evidence here. And for once with a band like this, trying to encompass psychedelia, folk-rock, hard rock, and progressive rock between two covers, they don’t over-reach on their magnum opus “Colour Questions,” the record’s 12-minute centerpiece. If the Yardbirds had stuck with psychedelic music and not strayed too far into mushy pop music (like into Mickie Most territory), they might have generated something like this piece, which never quite overstays it’s welcome; and the number of voices and voicings that Johnson and Thomas come up with for their guitars offers a brace of surprises across 12 minutes. The group’s prog rock impulses are also expresse