PRESS PHOTO BY PAUL WILLISTEINThe Pennsylvania Sinfonia Orchestra concluded its 2016-17 season April 1 with the concert, “Power and Grace,” at First Presbyterian Church of Allentown, Cedar Crest Boulevard and Tilghman Street, Allentown. Attending the post-concert reception, from left: Corliss Bachman, PSO Executive Director; Dr. Allan Birney, PSO Music Director, and Bella Hristova, violin, PSO