Late! I’m so sorry…
Jimmy Page is here on the Julie Felix show, playing White Summer/Black Mountain Side on acoustic guitar. It’s probably my favorite version of the instrumental.
Sadly, the video quality is… poor… but then this is recovered raw footage. It aired on April 26, 1970.
If you listen closely, from 2:57 to 3:21, it sounds like he’s riffing on “Friends” just a tiny bit (different key and arrangement, obviously, but still).