 Around this time, Willie Dunivan passed the lead vocal duties to his son Derek who at 15 assumed the frontman role for the band.Upon returning to Houston after the tour and on the request of Scott Givens and Lemmy, Sharon Osbourne flew down to see the band play a showcase gig in October.Willie sang for the first half of the set followed by the new lineup of Derek - lead vocals / lead guitar, Evan -drums, Mike - bass / backing vocals, and Jarrett - rhythm guitar / backing vocals making their first live appearance without Willie.