This is newly discovered footage features a very young Peter Gabriel joining Anthony Phillips and John Mayhew on stage at the Atomic Sunrise festival in March 1970. Also unearthed as part of this festival are extremely rare looks at a very young Hawkwind and David Bowie as well. How such important and legendary footage of bands from this era have been kept out of the public eye for so long remains a deep mystery. I guess you never know what people have stored away in boxes in warehouses all over the world. I bet the makers of the recent Genesis box-sets would have loved to have this footage to add to the Trespass DVD.
I wouldn't be surprised to see the full concert footage to be bootleged in the near future. Until then you can check out these surprisingly high quality clips on Youtube.