Led Zeppelin have released a video of them performing "In My Time of Dying" in May 1975 at Earls Court in London, which you can watch on YouTube.
The release is in conjunction with next Friday's release of Live EP in celebration of the 50th anniversary of their sixth album, 1975's Physical Graffiti, which that song is from.
Live EP also includes "Trampled Under Foot" from Earls Court, and “Sick Again” and “Kashmir” from the 1979 Knebworth Festival in England.
Also out on September 12th is a remastered version of the 2015 deluxe edition of Physical Graffiti, which contains a bonus disc of rough mixes and early versions of songs, plus a new replica Physical Graffiti poster.