Wow! No idea about the background to these videos clips, but they're prime time Cavan and make great viewing. Even those poor sensitive souls who say Cavan is a bit too loud and gruff can enjoy these - you just gotta get past the prejudice first.
The first clip is just Cav on his lonesome, the second is with the Rhythm Rockers and a beard. A legend.
The video below is a nine minute documentary, looking at Crazy Cavan and the Rhythm Rockers appearance at The Magnet, Dublin in 1980. If you can't be arsed to watch it all at least watch it from the eighth minute on. Classic.