Brahms's Vocal Duets and Quartets with Piano

Introduction
Three Duets for Soprano and Alto (Op. 20)
Four Duets for Alto and Baritone (Op. 28)
Three Quartets (Op. 31)
Liebeslieder (Op. 52)
Four Duets for Soprano and Alto (Op. 61)
Three Quartets (Op. 64)
Neue Liebeslieder (Op. 65)
Five Duets for Soprano and Alto (Op. 66)
Four Ballads and Romances for Two Voices (Op. 75)
Five Romances and Songs for One or Two Voices (Op. 84)
Four Quartets (Op. 92)
Zigeuner...