Among the leading figures in Greece's early music movement, conductor George Petrou also directs performances of operetta and musical theater. He is the artistic director of the early music group Armonia Atenea. Petrou make his recording debut in 2004 with a performance of Handel's pastiche Oreste, leading the Camerata Stuttgart. In 2011, he led Armonia Atenea on a recording of Handel's Alessandro Severo and composer Niccolo Chalichiopulo Manzaro (also known as Nikolas Mantzaros). An unusual feature of his career is that he also conducts musical theater presentations, including those of Cole Porter's Kiss Me, Kate and Stephen Sondheim's Sweeney Todd. In 2023, he led Armonia Ateneo in a recording of Nicola Porpora's opera Carlo il Calvo.