YouTube's Ritchie Blackmore Channel has always posted a good deal of interesting content. One of the best clips to turn up contains some rarely seen footage of Eddie Van Halen—clearly backstage—playing a few Blackmore/Deep Purple riffs on his guitar.
In the video, which you can watch below, he starts off with Deep Purple's "Hard Lovin' Man" (up to about 11 seconds in—although the bassist is playing "Space Truckin'" at first), followed by a bit of "Speed King," then "Space Truckin'." It's important to note that the original "Space Truckin'" riff was played on keyboards by the late Jon Lord.
"It depends on my mood. He is probably the most influential player in the last 15 years 'cause everybody's gone out and bought one of those, what does he play, Charvel, Carvel ... Kramer, with the locking nut. Yes, with the locking nut! And everyone's gone hammer-on crazy! So he's obviously done something. He's a great guitar player, but I'm more impressed by his recent songwriting and keyboard work. I think he's going to be remembered—he could be the next Cole Porter."