You might not expect a comedy routine during a conversation with Robert Plant and Alison Krauss.

But the rock ‘n’ roll lion and the bluegrass chanteuse who became an unlikely musical pair 17 years ago with their rootsy collaboration “Raising Sand” are relaxed, playful and exceptionally respectful of each other.

And very funny.

In a joint interview a few days before the June 2 launch of another summer of touring behind “Raise the Roof,” their 2021 acclaimed follow-up to the Grammy-winning “Raising Sand,” the pair begin by disagreeing about when their last tour ended (it was July) and tease each other while answering how they might change the set list for this run of dates.

“We haven’t started yet, but we have 39 shows. so I think we’ll consolidate and play to our strengths initially,” Plant says.

“And then we’ll play to our weaknesses,” Krauss jokes.

“See what I’m dealing with?” Plant responds with mock exasperation.

For 25 minutes, the pair banter about aging (he is 75, she 52), why sleep is “crucial” while touring and the art of harmonizing.

“I’m trying my best to learn how to get it right,” Plant, one of the mightiest singers in rock history, says with discernable humbleness.

Robert Plant: I’ve been very busy following my north star and reaching into the great old world of R&B for songs I might do something with down the road. And watching football (soccer).

Alison Krauss: I’ve been watching documentaries about The Mothman. And have been in the studio with Union Station working on a new album.

Krauss: It’s much more laid-back with Robert. The studio has its own unpleasantness, and it’s a much more relaxed environment here. I can’t believe I get to do both.

Plant: You have a lot more notes to worry about in that band. I’ve learned a lot in my time around Alison and the world that comes with her, and it’s been a spectacle of charm, politeness and peach cobblers.