From “50 Greatest Guitar Solos” on Guitar World’s website:
2) “Eruption” (Eddie Van Halen) – Van Halen Van Halen, 1978
It is hard to imagine a more appropriately titled piece of music than Edward Van Halen’s solo guitar showcase, “Eruption.” When the wildly innovative instrumental was released in 1978, hit the rock guitar community like a hydrogen bomb. Two-handed tapping, gonzo whammy bar dips, artificial harmonics—with Van Halen’s masterly application of these and other techniques, “Eruption” made every other six-stringer look like a third-stringer.
But the most remarkable thing, perhaps, about the unaccompanied solo is that it almost didn’t make it on the guitarist’s debut album.
“The story behind ‘Eruption’ is strange,” says Van Halen. “It wasn’t even supposed to be on Van Halen. While we were recording the album, I showed up at the studio early one day and started to warm up because I had a gig on the weekend and I wanted to practice my solo-guitar spot. Our producer, Ted Templeman, happened to walk by and he asked, ‘What’s that? Let’s put it on tape!’
“I played it two times for the record, and we kept the one that seemed to flow. Ted liked it, and everyone else agreed that we should throw it on the album. I didn’t even play it right—there’s a mistake at the top end of it. Whenever I hear it, I always think, ‘Man, I could’ve played it better.’”
As for the distinctive echo effect on the track, Eddie recalls that he used a relatively obscure unit—a Univox echo chamber. “It had a miniature 8-track cassette in it, and the way it would adjust the rate of repeat was by the speed of the motor, not by tape heads. So, if you recorded something on tape, the faster you played the motor back, the faster it would repeat and vice versa. I liked some of the noises I got out of it, but its motor would always burn out.”
“I like the way ‘Eruption’ sounds. I’d never heard a guitar sound like that before.”