Opporknockity, and a short collection of other terrible music jokes

Mr. Opporknockity is a superb piano tuner. He has spent more than 30 years honing his craft and has made quite a reputation for himself.

He got a call from a guy who had just bought a new grand piano and requested Mr. Opporknockity to come and tune it. Mr. Opporknockity spent more than 3 hours tuning the grand piano to perfection, collected his fee and left.

A couple of days later, the customer calls Mr. Opporknockity and informs him that the piano is not in tune.

The customer demands Mr. Opporknockity to return and re-tune the piano. To which Mr. Opporknockity replied, "My friend, you have missed out. Opporknockity only tunes once."
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A drummer, looking to turn his life around, decides its time to change instruments. He walks into a shop with the intention to buy a trumpet.

He walks up to the front desk and addresses the manager.

"Good day, sir. I would like to purchase a trumpet."

"A trumpet, you say?" replies the manager. "Tell me, young man are you a drummer?"

"Yeah dude!-- uh, I mean, yes sir. How did you, like whoa. How did you know?"

"Son, this is a pet store."

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I can't bear to listen to the song Stayin' Alive... I dunno, something about the BeeJees just gives me the Heebeejeebees.

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Three notes walk into a bar, an A, a C, and an E. The bartender looks at them and says, "I'm sorry, but we can't serve minors."

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A local bar advertises that it had hosted many great music legends long before they made it big. A passerby decides to give the joint a try.

He enters the establishment, and is blown away. The walls are covered in thousands upon thousands of photographs of famous music artists, spanning years of history. There were photographs of Marvin Gaye, Green Day, Rolling Stones, Aerosmith, Wheezer, P!nk, Lil Wayne, Matchbox Twenty, Radiohead, Ray Charles, Bob Barker, Stevie Wonder, Elton John, you name it. If they had a record deal, they had a photo in this bar. Each of the photographs featured the famous person or group, standing in front of the bar stage, with an arm around a man who appeared to be the bar owner.

The pedestrian decides to locate the manager and congratulate him on what seemed to be decades’ worth of tending bar (and hosting start up gigs for some great talent)....

*Ok, now I know that this sub is usually for completed jokes, but I've been trying to think of a punchline for this one (or something with a similar set up) for like two hours now. It's exhausting and going nowhere. If anyone has any ideas, shout 'em out...