 The choral program includes two all @-@ female choirs known as Treble Choir and Women 's Chorale , a mixed four @-@ part choir called ChoralWorks , and an all @-@ male choir known as Men 's Chorus . Membership in ChoralWorks and Women 's Chorale is determined by audition . The choirs generally have three concerts during the school year , with additional performances in and outside of school at various times of the year . There are also three additional extracurricular ensembles , two all @-@ female ensembles — Junior Varsity Women and Varsity Women — and one four @-@ part mixed ensemble called ACEs ( Advanced Choral Ensemble ) , all of which are determined by audition at the beginning of each school year . Every May , the choirs , along with the Jazz Band , stage a pops concert that features music from a variety of time periods and genres and also includes choreography and additional solo and small group performances . The concert has been held every year since 1970 . Since 2013 , a madrigal dinner in the style of a Medieval or Renaissance boar 's head festival , is held in early December . Members of ChoralWorks and Women 's Chorale wear period costumes and sing period repertoire while guests are served a three @-@ course meal . 
