U2 announced earlier this year they would be headlining a new Las Vegas residency this fall, but their drummer, Larry Mullen Jr., would be missing it in order to continue to recover from surgery. Fans were not happy about the news, and it turns out bassist Adam Clayton has some reservations, as well.

"I don't know what it's going to be like," Clayton tells Billboard. "I haven't played with anyone else before. I know playing with Larry Mullen, he always made me sound good, and that was half the job done."

But Clayton notes having Bram van den Berg fill in for Mullen "might just keep us on our toes. I'm sure we'll find our groove."

And to assure fans things will be OK, Clayton offers, “I think Bram is a great player. He’s got a great reputation. He’s a lovely man. If the musician’s heart is in the right place, the music follows without too much difficulty.”

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