Darren Caperna, the singer for American AC/DC tribute band Back In Black earned an audition and tried out with the band in Atlanta. Online reports state AC/DC tracked Caperna down via telephone with the singer subsequently flown to Atlanta for a private rehearsal.
Accompanying Caperna on the trip was founding Back In Black member and guitarist Mike Mroz. "After the soundcheck, Darren and I were talking to the guitar techs, and all of a sudden I look over my shoulder and Angus Young was standing behind me waiting to say hi!" said Mroz.

Caperna ran through some 21 songs with the band in an exhaustive rehearsal set including the entire 'Rock Or Bust' album."Before we started 'Riff Raff', Angus came up to me, and said, 'I'm warning you in advance that we are still a little rusty on this song!' Did I just hear Angus apologizing to me?," exclaimed Caperna.