“Confess your sins” is carved in gothic letters on the wood above the crimson-curtained entrance to a strange little booth tucked inside the Grammy Museum in downtown Los Angeles.

And sure, rock stars and country singers, rappers and jazz musicians have definitely done their share of sinning in the past. But that’s not what this temporary display is about.

No, this is the Ghost pop-up devotional, a confession booth, a photo booth, loaned to the museum by the theatrical Swedish metal band Ghost.

In it, fans are invited to “bare their souls about why they think Ghost are the best rock band in the world,” according to a news release about the addition to the museum. “Make amends and leave atoned.”

The devotional’s arrival at the Grammy Museum in late August is timed to a pair of Ghost shows at the Forum in Inglewood on Monday and Tuesday and will remain on display until Sept. 17.

On a wall next to the booth, a sign titled “MESSAGE FROM THE CLERGY” — also the title of the band’s recent EP — introduces the pop-up.

“We wish to inform you the #GhostDevotional is now open for you to confess your sins to Papa Emeritus at the @grammymuseum,” it reads. “We implore you to visit the exhibit, sit in the handcrafted confession booth and share why you think Ghost is the Best Rock Band In The World.”

Papa Emeritus — or Papa Emeritus IV, to be precise — is the current persona of frontman Tobias Forge, who co-founded the band in 2008. A sort of demonic-looking pope character, Papa has gone through various looks and incarnations over the years.

The museum also currently has a display of his Papa Emeritus III outfit — known by fans as the Dead Astaire costume — which was worn to the 2015 Grammys, when Ghost won the award for best metal performance for the song “Cirice.”

Forge appears onstage in skull-like makeup, religious vestments and holy hats, including recently a cornette, which looks a bit like a nun’s wimple blown out and blackened. The others in Ghost are known as the Nameless Ghouls and remain obscured inside various masks and costumes.

A casual visitor to the museum might not know exactly what they’re getting into when they enter the booth. There’s no need to worry — demonic possession is very unlikely (we think) — and you leave with a few nifty photo booth snaps with Papa’s spooky face as the backdrop.

Grammy Museum

When: Through Sept. 17. 11 a.m.-5 p.m. Mondays, Wednesdays, Fridays and Sundays; 10 a.m.-6 p.m. Saturdays; closed Tuesdays

Where: 800 W. Olympic Blvd., Los Angeles

Tickets: $12-$18 at grammymuseum.org

Ghost

When: 7:30 p.m. Monday-Tuesday

Where: The Forum, 3900 W. Manchester Blvd., Inglewood

Tickets: $59.50-$389 at Ticketmaster.com