Audio of what appears to be Guns N' Roses frontman Axl Rose rehearsing with AC/DC has surfaced. Listen to the embedded videos above and below for a sneak peek at what sounds like "Thunderstruck," "Shoot to Thrill," "Hells Bells," "Hell Ain't a Bad Place to Be" and "Back in Black."

Much remains unclear about these fan-shot clips. There is no identifying video with the songs, which appear to have been recorded outside of a rehearsal studio. One of the video titles, however, mentions Lisbon - where AC/DC's first concert with Rose is scheduled for Saturday (May 7).

All of this, of course, is pure speculation. What we do know: Rose will fill in for Brian Johnson as AC/DC resumes their Rock or Bust tour. The band's European stadium stops run through June 12 in Aarhus, Denmark.

Hear Axl Rose Reportedly Performing "Thunderstruck" with AC/DC

"Hells Bells"

"Hell Ain't a Bad Place to Be" / "Back in Black"

Rose will then return to the on-going Guns N' Roses reunion tour, dubbed "Not In This Lifetime ..." AC/DC also has 10 postponed U.S. summer dates, which will likewise reportedly be rescheduled with Rose as frontman.

Johnson dropped out after news broke in early March that he was dealing with a potentially career-ending hearing problem. Rose almost immediately became the focus of replacement rumors. He was then apparently photographed leaving a rehearsal studio with AC/DC later in March – though nothing was initially confirmed by either camp. By then, Guns N' Roses had already announced a string of stops for a long-awaited tour featuring Rose and fellow co-founders Slash and Duff McKagan.

Rose was confirmed as AC/DC's replacement singer on April 16, not long after taking part in a club-date debut with the reunited Guns N' Roses.

Every Guns N' Roses Song Ranked