Wolfgang Van Halen, son of Eddie, has posted a video of himself playing his dad’s iconic instrumental piece “Eruption” to mark its 40th anniversary. You can watch the new clip above, and the original below. He’s seen playing Eddie’s original Frankenstein guitar, which was used to lay down the track on Sept. 8, 1977.

“Eruption” appeared on Van Halen’s self-titled debut album the following year and was released on the B-side of “Runnin’ With the Devil” – although Eddie himself had always doubted it was worth recording. He said in the book Van Halen Rising by Greg Renoff (as quoted by Van Halen News Desk): “Our producer, Ted Templeman, heard me practicing it for an upcoming gig and asked, ‘What the hell is that?’ I said, ‘It’s a thing I do live. It’s my guitar solo.’ His immediate reaction was, ‘Roll tape.’ I just didn’t think it was something we’d put on a record. Everyone else agreed that we should throw it on.”

Wolfgang Van Halen – who joined Van Halen in 2006 at the age of 15 – recently released a 10-second clip of a track from his upcoming debut solo album, which he’s been recording as a one-man project. His father confirmed the album was underway in 2015 and described it as “AC/DC meets Van Halen meets aggressive pop” and added: “The riffs are catchy. It’s a little of everything and sounds like a freight train coming at you. I’ve never heard anything quite like it. It’s so powerful that I’m jealous.”