As you and your dad probably already know, Led Zeppelin are reissuing deluxe editions of their complete discography that include versions remastered by Jimmy Page and full discs of completely new music. Today, they've shared a preview of an unreleased version of "Black Dog," which includes new guitar parts and a different vocal track from Robert Plant. This one comes from the reissue of Led Zeppelin IV, which will be released October 28th along with the reissue of Houses of the Holy. Stay tuned.
Listen to an alternate recording that will be released as part of a massive reissue.