"Here's one from my new album" are six words fans would probably rather not hear at a gig.
You might think that Taylor Swift would be immune from that but, based on the reaction to her changing her setlist one year in to her worldwide Eras tour, you'd be wrong.
When she announced that she'd revamped her track selection to incorporate music from her latest double-release, The Tortured Poets Department, reviews were mixed.
Some were delighted that new tunes like Fortnight and Down Bad were in, but others were disappointed to see older songs Long Live, The Archer and The 1 cut from the record-breaking tour.
But you're never going to please anyone, even if you're Taylor Swift.
So how do artists go about picking a setlist?
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Charli XCX, who's just released her latest album Brat, tells BBC Newsbeat the songs she picks are very much based on how she’s feeling.
'A fine balance'
The Von Dutch singer describes herself as "quite a selfish performer generally".
"I'm performing because I like listening to my own music out loud," she says.
"I've done the setlist for me rather than for anybody else.
"I think that's how you grow and you show people the new ways in which you're developing, and your new tastes.
"And playing the same songs over and over and over again is really quite boring.
"So I like to switch it up."
Chase & Status, who recently headlined Radio 1 Big Weekend, have released multiple albums and been putting out tracks for over 20 years.
That makes choosing your setlist tricky, as you're potentially trying to please different generations of fans.
"I think you're always kind of second guessing what the crowd is gonna be like," says Saul Milton, aka Chase.
"Is it going to be fans of your older stuff or your new stuff? So it's just making sure you don't forget where we came from.
"But also you can't forget that there's young fans that maybe don't know our old stuff.
That's why it important to have "a nice balance," he adds, "because it's not just about what we want to hear".
"We're performing our music to people that support us. So we want to make sure they're happy."