Terrence McNally's play "Master Class" delves into the world of the legendary opera diva Maria Callas, based on the master classes she conducted at the Juilliard School in the early 1970s. The production reveals Callas's demanding and uncompromising personality, challenging young artists to seek truth in music and within themselves, while intertwining the present with Callas's memories of triumphs, losses, solitude, and relationships. Behind the divine Callas, a woman emerges who paid a high price for her place in art and life. The role of Maria Callas is performed by one of Latvia's most outstanding opera singers and multiple Grand Music Award laureate, Sonora Vaice, marking her debut in dramatic theatre and serving as her diploma work for the Latvian Academy of Culture's theatre directing program.