Grammy-Award winner Billie Eilish has been announced as a special guest to Danny Elfman’s live-to-film concert experience of Tim Burton’s The Nightmare Before Christmas for two nights at Los Angeles’ Banc of California Stadium on October 29 and 31.

Eilish will perform “Sally’s Song” at the event, which will contain a full orchestra led by conductor John Mauceri to perform the film’s score and songs live. “I’m absolutely thrilled to have Billie joining up with the nightmare crew!” Elfman said in a statement.  “This will be a real treat (not a trick)!”

She will also be accompanied by Elfman, who will be reprising his role of Jack Skellington for both nights. Other guests include “Weird Al” Yankovic and Ken Page singing the roles of Lock and Oogie Boogie. Tickets for the event are on sale now via Ticketmaster and will include trick-or-treating and a fan-voted costume contest that will take place at the venue.

Eilish is set to play the Austin City Limits Music Festival this weekend and next, alongside Miley Cyrus, George Strait, Erykah Badu, Phoebe Bridgers, Megan Thee Stallion and many more.

Elfman recently collaborated with Nine Inch Nails’ Trent Reznor for a reimagined version of his single “True” from his latest album Big Mess, released in June.