 C clefs (along with G, F, Γ, D, and A clefs) were formerly used to notate vocal music.Nominally, the soprano voice parts were written in first- or second-line C clef ("soprano clef" or "mezzo-soprano clef") or second-line G clef ("treble clef"), the alto or tenor voices in third-line C clef ("alto clef"), the tenor voice in fourth-line C clef ("tenor clef") and the bass voice in third-, fourth- or fifth-line F clef ("baritone", "bass", or "sub-bass clef").Until the 19th century, the most common arrangement for vocal music used the following clefs