Cheap Trick has put up some amazing stuff from their 1970s peak on youtube. Their Rock Concert performance was one of the things that got me hooked on them, and it's just as brilliant as ever now. "Hello There"/"Come On Come On" is still the greatest opening 1-2 punch ever. Here are those songs and "Elo Kiddies" from their first album. There are two other segments from the show up on youtube.