… CAS Talk: Senzeni na (What Have We Done)? Music, Social Change, and Incarceration in the Anti-Apartheid Struggle in … … CAS Talk: Senzeni na (What Have We Done)? Music, Social Change, and Incarceration in the Anti-Apartheid Struggle in … Yale University’s Institute of Sacred Music and Visiting Professor in Yale’s Department of Music, an Affiliate of the …