"Sibling Rivalry – The Rematch! – This Time It's Personal!":

Barber – Allegro from the Concerto for Violin;

Dohnanyi - Piano Quintet in C Minor, Op. 1.

The Baileys (Allison, violin/viola and Zuill, Cello); The Kims (Helen, violin and Michael, piano);  The Ransoms (Kate, violin and William, piano).