Rock is religion billy gibbons t shirt zz top front man billy gibbons is as well known for his iconic beard as he is for fronting one of the greatest rock and roll groups of the last 30 years together with dusty hill and frank rube beard they progressed from their original band american blues to become zz top in 1971 with a dusty blues sound that set them apart from the crowd they quickly became household names throughout the next 3 decades this rock is religion t shirt features a license