With Apprentice Conductor Andrew Bisantz at the helm and soprano Sonia Kentrianakis as featured soloist, the Buffalo Philharmonic Orchestra will be playing two concerts this week. First up is a performance at 2 p.m. Sunday in the Fredonia Opera House, located at 9 Church St. on Fredonia's central square. The program of music by Mozart, Ravel and Barber will be repeated at 7:30 p.m. Wednesday in Canisius College's Carol and Carl Montante Cultural Center. Bisantz is a Buffalo native, a Fredonia State College graduate, and the youngest student ever to receive a master's in conducting from the Cleveland Institute of Music. Sonia Kentrianakis was a finalist in the Jenny Lind Competition who received her master's degree from the Brooklyn College Conservatory. As the centerpiece of these concerts she will sing Ravel's "Five Popular Greek Songs" and Samuel Barber's "Knoxville, Summer of 1915." Bisantz and the BPO will open and close the concerts with Mozart, the Overture to "The Magic Flute" and Symphony No. 38, respectively, and will also perform Ravel's lush and colorful "Mother Goose Suite."