Led Zeppelin have shared a preview of the unreleased material on the upcoming Physical Graffiti deluxe reissue.

The alternate mix of “Houses of the Holy” — which is streaming online now — is noticeably different than the final version. It’s a bit shorter and has a different mix for the guitar and bass parts, and Robert Plant‘s vocals are definitely more raw. Oh, and there’s more cowbell!

The various Physical Graffiti reissues will be released on February 24th.