"It's Alive" by the Ramones is considered one of the best punk live LPs, if not one of the best live LPs, of all time. The basis for that LP was this show at the Rainbow Theatre in London, which was one of the classic live venues in the UK during the 70s and early 80s. In 1977, the Ramones were at their peak, enjoying a blistering streak of three classic LPs: Ramones (1976), Leave Home (1977), and Rocket to Russia (1977).
This 26 minute clip is not the full show that comprised "It' Alive", but instead appears to be a 14 song compilation from the 2007 DVD release "It's Alive 1974--1996". I'm not sure if the full concert is available online. I need to return to my incomplete drafts, but until then enjoy this slice of 1977.