Rumors are circulating that one of American Idol’s Top 4 will cover a tune that’s already been a huge hit for FOX in the past: Journey’s “Don’t Stop Believing.” We’re hearing that the Wednesday night version of the song will be “mind-blowing.” And, we know who’s singing it. We also know which former Idol is coming back for the finale... to sing a duet with Jack Black. Follow the jump to get all the details...

E! News reports that James Durbin will sing the 80s-era hit, which became the banner song of Glee’s debut season. Durbin has been known for his big numbers during the season, and we’re positive his version won’t sound anything like Glee’s. He’s been known mainly for his love of heavy metal, though he has taken songs in a wholly different direction over the past weeks as well. Durbin will perform the song on Wednesday's Top 4 night.

Is he a likely candidate for the Top 2? Idol's finale will feature the final two contestants... plus a few special guest stars. Jack Black will be performing a duet with Casey Abrams, who was eliminated in sixth place. Ellen DeGeneres shared the spoiler with him while he appeared on her show. Watch his reaction in the video above.