The famed Philly venue’s first performer will be its last By Denny Dyroff, Staff Writer, The Times Ben Vaughn (center) brings his Quintet to the final two shows at Philly’s Tin Angel., Saturday. Mike McGann photo. Alpha (α) and omega (Ω) are the first and last letters of the Greek alphabet. They also could be used to describe the final night at The Tin Angel (20 South Second Street, Philadelphia,...