Concert holograms are generally a bad idea. But ABBA has big, cool plans for a hologram-fronted tour, and excitement around that bizarre idea has convinced the flesh-and-blood band to reunite.

The Swedish band made the surprising reunion Instagram-official on Friday. After more than three decades apart, the four members teamed back up to record some new music together.

SEE ALSO:ABBA performed for the first time in 30 years AND NO ONE RECORDED IT?

"The decision to go ahead with the exciting ABBA avatar tour project had an unexpected consequence," the post reads. "We all four felt that, after some 35 years, it could be fun to join forces again and go into the recording studio."

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The reformed band's time together resulted in two new recordings, one of which -- called "I Still Have Faith In You" -- will air on TV, via NBC and the BBC, in December.

The TV special sounds like some kind of preview for the avatar tour, which is expected to kick off in 2019 or 2020. Flesh-and-blood ABBA won't be performing the new tune live; we'll hear it via their virtual selves.

The Instagram post ends on a positive note: "We may have come of age, but the song is new. And it feels good."

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TopicsMusic