Ronnie James Dio performing "Rainbow In The Dark" on a US late night television show, "The Rock Palace." I believe this was recorded very shortly after the release of the "Holy Diver" album.
From the same show, also see:
Stand Up and Shout
http://www.youtube.com/watch?v=zixIuxzCCvs
Man On The Silver Mountain
http://www.youtube.com/watch?v=vOyFE-1LAI0