PRESS PHOTOS BY RICHARD PECKHAM The Allentown Symphony Orchestra was on stage for the first time in 13 months for “Magnificent Mozart,” 7:30 p.m. April 17, Miller Symphony Hall, Allentown. The digital stream premiere is 7:30 p.m. May 1 with the concert available online. Above: Omri Barak, ASO Principal Trumpet, performs “Corno da Caccia Concerto in E-flat Major,” by J.B.G. Neruda. Diane Wittry, ASO Music Director, conducted 32 members of the orchestra for “Symphony No. 40 in G minor, K 550,” by Mozart. Also performed: “Overture No. 2 in E-flat Major, Op. 24,” by Louise Farrenc. Tickets: www.MillerSymphonyHall.org