ABBA—one of the most commercially successful musical acts of all-time—announced today that all four members reunited in the studio to record their first new music in over 35 years. The Swedish pop group revealed that they have recorded two new songs, including one titled “I Still Have Faith In You”.

“I Still Have Faith You” is slated to premiere during an NBC and BBC-produced television special this December. Interestingly, the song will be performed by hologram avatars of ABBA, marking the debut of the previously-announced “Abbatar” project. The group has been working on developing Abbatar since 2016, and they plan to take the show on the road for a world tour tour.

According to Rolling Stone, ABBA teamed up with American Idol and So You Think You Can Dance creator Simon Fuller to develop hologram avatars of the band that will be utilized during the upcoming tour. Evidently, ABBA will use virtual reality technology to “de-age” themselves and present recreations of the group as they looked during their heyday in 1979. The technology will reportedly be different from the holograms that have been utilized by other acts’ live shows in recent years.

 “We’re inspired by the limitless possibilities of what the future holds and are loving being a part of creating something new and dramatic here,” ABBA’s Benny Andersson once said of the avatar project. “A time machine that captures the essence of who we were. And are.”

As of now, no information about world tour dates or the other new ABBA single have been revealed.