The Mendelssohn Choir of Pittsburgh will perform Mozart's unfinished Great Mass in C Minor and Copland's "In the Beginning" on March 25th at 3:00pm at East Liberty Presbyterian Church. Mildred Miller Posvar, famous mezzo-soprano and founder of Opera Theater of Pittsburgh, will give a free pre-concert talk at 2:00pm. Buy your tickets online and save $5 on the door price.