SAN DIEGO, CALIFORNIA - APRIL 10: (L-R) Guitarists Nuno Bettencourt, Zakk Wylde, Steve Vai, Yngwie Malmsteen, and Tobin Abasi of Generation Axe perform on stage at Humphrey's on April 10, 2016 in San Diego, California. (Photo by Daniel Knighton/Getty Images)

SAN DIEGO, CALIFORNIA - APRIL 10:  (L-R) Guitarists Nuno Bettencourt, Zakk Wylde, Steve Vai, Yngwie Malmsteen, and Tobin Abasi of Generation Axe perform on stage at Humphrey's on April 10, 2016 in San Diego, California.  (Photo by Daniel Knighton/Getty Images)