Tu es Petrus C-Dur (1872)

Women’s and men’s voices and the baritone soloist sing in alternating dialog. The composition was probably written in 1872, at a time when Fauré was working alongside Charles-Marie Widor as organist an the church of Saint-Sulpice in Paris. The organ version with mixed voice chorus and baritone solo can be complemented with the addition of a string quintet. 

The score of the version without strings (Carus 70.301/20) is at the same time a chorus score and organ part for the version with strings.