Listen to Axl Rose Sing 'Back in Black' at His First Show With AC/DC

Axl/DC is upon us. Guns N' Roses frontman Axl Rose made his debut with AC/DC in Lisbon, Portugal last night, after longtime lead singer Brian Johnson was forced to bow out of his band's tour last month to preserve his failing hearing. At least one ticket vendor is offering refunds to fans unhappy with the switch. "It's because of an unfortunate circumstance," Rose said…