Human: What is the significance of the AABA-chorus form in "Show Boat"? Assistant: 
"Show Boat" was structured with two choruses – a black chorus and a white chorus. One commentator noted that "Hammerstein uses the African-American chorus as essentially a Greek chorus, providing clear commentary on the proceedings, whereas the white choruses sing of the not-quite-real. "In "Show Boat" Jerome Kern used the AABA-chorus form exclusively in songs sung by African American characters ("Ole Man River", "Can't Help Lovin