There are several academic honor groups on campus.[64] There are multiple music ensembles at USAO, including concert band, jazz band, smaller instrumental ensembles, concert choir, and jazz choir, which are open to majors and non-majors.[65] The University has one fraternity, Phi Lambda Chi, and one sorority, Sigma Psi Omega; as of 2013, approximately 3% of men and 6% of women participated in Greek life.[64][66] The Student Government and Student Activities Board plan events for all students and guests throughout the year.