The title is a combination of the words "Sade" and "sadness." "Sade" refers to Marquis de Sade, a French novelist whose sexual activities gave us the word "sadism." He believed sex had to be painful in order to be pleasurable. The background vocals are a Gregorian chant, which is a kind of singing popular in a lot of church music. The lyrics are in Latin, which are how many of the chants were sung in church.
