Sounds of Frederic Chopin, Johannes Brahms and Sergei Prokofiev will waft through the air of Hoag Auditorium on the University of North Georgia’s Dahlonega as Joe Chapman pounds out the notes in a free piano concert Saturday night. Chapman will be joined in the 8 p.m. concert by fellow UNG music faculty members, Carla Ganyard on violin and Esther Morgan-Ellis on cello in a presentation of Ludwig van Beethoven’s “Kakadu Variations.” Chapman has served as director of piano studies at the University of North Georgia since 1983.