1911 Encyclopædia Britannica, Volume 17… (1911)
“ Now the texts of the Gloria and Credo were more voluminous than any others which 16th-century composers attempted to handle in a continuous scheme. The practical limits of the church service made it impossible to break them up by setting each clause to a separate movement, a method by which 16th-century music composers contrived to set psalms and other long texts to compositions lasting an hour or longer. ”
