All parts:
Soprano I only (top line), plus solo:
Soprano I karaoke (all but Soprano I):
Soprano II only (second line), plus solo:
Soprano II karaoke (all but Soprano II):
Alto I only (third line), plus solo:
Alto I karaoke (all but Alto I):
Alto II only (bottom line), plus solo:
Alto II karaoke (all but Alto II):