Complex sentence: In addition there are extra-curricular ensembles such as the premiere group, Madrigals (SSAATTBB), Girls Ensemble (SSAA), and various female and male barbershop quartets (Tenor, Lead, Baritone, Bass).
Split into simpler sentences: In addition there are extra-curricular ensembles such as the most premiere group "The Madrigals". There are also various female and male barbershop quartets (Tenor, Lead, Baritone, Bass).