Yesterday, for the first time onstage in almost 12 years, prog rock supergroup Emerson, Lake & Palmer -namely vocalist/bassist Greg Lake, keyboardist Keith Emerson and drummer Carl Palmer reunited for a one-off 40th anniversary concert, headlining the High Voltage Festival event in Victoria Park, London.

Heres the first video evidence of that reunion in the form of fan filmed footage of "Karn Evil 9", originally from ELP's 1973 album 'Brain Salad Surgery' "