C2 (two Cs below middle C). However, some extreme bass singers, referred to as basso profondos and oktavists, are able to reach much lower than this. In choral music In SATB four-part mixed chorus, the bass is the lowest vocal range, below the tenor, alto, and soprano. Voices are subdivided into first bass and second bass with no distinction being made between bass and baritone voices, in contrast to the three-fold (tenor–baritone–bass) categorization of solo voices. The exception is in arrangements for male choir (TTBB) and barbershop quartets (TLBB), which sometimes label the lowest two parts baritone and bass. Subtypes and roles in opera Within opera, the lowest note in the standard bass repertoire is D2, sung by the character Osmin in Mozart's Die Entführung aus dem Serail, but few roles fall below F2. Although Osmin's note is the lowest 'demanded' in the operatic repertoire, lower notes are heard, both written and unwritten: for example, it is traditional for basses to interpolate a low C in the duet "Ich gehe doch rathe ich dir" in the same opera; in Richard Strauss' Der Rosenkavalier, Baron Ochs has an optional C2 ("Mein lieber Hippolyte"). The high extreme: a few bass roles in the standard repertoire call for a high F or G (F4 and G4, the one above middle C), but few roles go over F4. In the operatic bass repertoire, the highest notes are a G4 (The Barber in The Nose by Shostakovich) and, in the aria "Fra l'ombre e gl'orrori" in Handel's serenata Aci, Galatea e Polifemo, Polifemo reaches an A4. Within the bass voice type category are seven generally recognized subcategories: basso cantante (singing bass), hoher bass (high bass), jugendlicher bass (juvenile bass), basso buffo ("funny" bass), Schwerer Spielbass (dramatic bass), lyric bass, and dramatic basso profondo (low bass). Basso cantante/lyric high bass/lyric bass-baritone Basso cantante means "singing bass". Basso cantante is a higher, more lyrical voice. It is produced using a more Italianate vocal production, and possesses a faster vibrato, than its closest Germanic/Anglo-Saxon equivalent, the bass-baritone. Max, Le chalet by Adolphe Adam Duke Bluebeard Bluebeard's Castle by Béla Bartók Don Pizarro, Fidelio by Ludwig van Beethoven Count Rodolfo, La sonnambula by Bellini Blitch, Susannah by Carlisle Floyd Méphistophélès, Faust by Charles Gounod The King of Scotland, Ariodante by George Frideric Handel Don Alfonso, Così fan tutte by Wolfgang Amadeus Mozart Don Giovanni, Don Giovanni by Wolfgang Amadeus