PRESS PHOTO BY REBEKAH HAWKFrom left, Mary Christman, of Allentown; James Supra, of Macungie, and Michael Christman, of Allentown, at the first Lehigh Valley Songs4Sight concert, presented by Provident Bank, to benefit the Center for Vision Loss, March 31, American Club Pavilion, Coplay. Performing were: James Supra Blues Band with Sarah Ayers; Common Bond, on stage, Yingling-Porter On Tap duo,