Beat me to it! This is pretty much the video that the Tenacious D video for Wonderboy was based on (at least, I think so).
I submit Van Halen’s Jump. It’s bare-bones cheesy. I can’t help but laugh through this whole video (and I love the song). In particular, I love that there is no keyboardist in the video, despite the fact that the song is almost entirely keyboard-based.
Rush wins some cheese awards. I submit Time Stand Still as one of many of their cheesy videos.
Well, that’s actually a parody video made in the 70’s for a Finnish sketch show called Hepskukkuu. Lately they found the guy who plays the lead singer in the video; he’s working as a librarian, iirc, and jokingly said that if they paid him enough, they would do a Gregorius reunion tour.
The Armi and Danny one, though, is real, unfortunately. They were going to go on to world domination with this English translation of their wonderful, wonderful act… or then again not.
The disco dude is also real. The man is Åke Blomqvist, a Finnish dance instructor who is about five centuries old and still teaches dancing. He’s a very old-type-gentlemanly person. I’ve been to his ballroom dancing class.