Vocalist-flutist-saxophonist Nik Turner has drifted across the seas of space and time with numerous unusual musicians since the late ’60s. He’s one of the few performers to have collaborated with both hippie rockers, such as Randy California’s Spirit, and punk royalty, including The Damned, The Ruts and The Stranglers. Turner is best known for his years with the spacey British prog-rockers Hawkwind, and tonight he appears with his latest incarnation of that long-running group. No matter what he calls his various backing bands, you can expect to hear such Hawkwind classics as “Silver Machine” (which was covered by The Sex Pistols) alongside trippy anthems by Turner’s more recent project Space Ritual. Even with his head in the clouds, Turner usually manages to channel his psychedelic divinations with driving hard-rock force.