Greg Hough
Greg Hough is a Christian musician and , with Bob Hartman , one of the founding members in 1972 of the Christian rock band , Petra . 
<triplet> Bob Hartman <subj> 1972 <obj> work period (start) <triplet> Christian rock band <subj> Christian musician <obj> subclass of <triplet> Petra <subj> 1972 <obj> inception <subj> Christian rock band <obj> genre