Spinal Tap II: The End Continues writer-director Rob Reiner may be amazed by the love that Paul McCartney and Elton John still have for performing, as both legendary musicians make cameos in the forthcoming sequel movie.

The follow-up to the 1984 cult classic This Is Spinal Tap hits theaters Sept. 12 from Bleecker Street. Christopher Guest, Michael McKean, Harry Shearer and Reiner star in the comedy about a heavy metal band reuniting for one last show.

During an interview with AARP Movies for Grownups, Reiner was asked whether Spinal Tap’s final concert featuring appearances from McCartney and John is intended as a statement about reinvention.

“It basically says: ‘No matter how old you are, if you can still do it and still enjoy doing it, then do it,’” Reiner replied. “I asked Paul McCartney about this. I said, ‘There’s you, Mick Jagger, Elton John, and you still like to perform. What is it about you guys? Is it that you just love the music? And you love performing?’” According to Reiner, McCartney responded with a line from the new movie: “And he says, ‘Yeah. And the drugs.’”

Reiner continued, “The point is, these guys just love doing it. If they’re given an opportunity, they’ll get in front of an audience and play.”

In a joint statement earlier this year, Bleecker Street CEO Andrew Karpen and president Kent Sanderson expressed their excitement for the sequel: “We feel privileged for the opportunity to work with Rob Reiner and the brilliant minds behind the original This Is Spinal Tap, and to be part of a film that has resonated with so many.”