Asia was notable for being a supergroup, its four members previously associated with several distinct groups. Click the link to hear clips of two 2000s supergroups, both formed by grafting the lead singer of one band onto the instrumentalists of another. WHO WAS THE FORMER FRONTMAN OF EITHER "BACKING BAND"?
AXL ROSE; ZACK DE LA ROCHA (edited at 8:37 am, February 4, 2017 (CST))
Original Answer: ZACK DE LA ROCHA; AXL ROSE