Bass (singer)
In opera, basses often have the part of the villain, or the king, or a priest. A buffo-bass is a character role in which the bass singer needs a wide range for the comedy of the part. The part of Leporello in Mozart's Don Giovanni needs a buffo bass. The lowest kind of bass is called a basso-profondo. An example is the priest Sarastro in Mozart's Magic Flute.