In the coming months, there are going to be a bunch of super deluxe reissues of Led Zeppelin's records with demos and that whole bag. Apparently along with that will come some unreleased material by the band, which is a very interesting prospect.
On the upcoming reissue of Led Zeppelin II we're going to get an instrumental poetically called "La La." You can check it out below, and for what it's worth it's actually really good, if not insanely cheesy 1960's jams that should be the intro music to an adventure show about dudes with cowboy hats and Mustangs. I'm down with it!