What is a duet plus solo?

A duet plus solo is a musical composition for three performers, typically two singers and one instrumentalist. The two singers perform a duet, while the instrumentalist accompanies them and also performs a solo. The instrumentalist's solo is usually played between the two vocal sections of the duet. Duet plus solos are often found in classical music, but they can also be found in other genres, such as jazz and folk music.