Deep C

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Deep C is the C two octaves below Middle C, and is also named C2. It is two ledger lines below the bass clef and is the depth opposite of Soprano C or C6, two ledger notes above the treble clef. Few men are capable of such depth, although the thickest basses can reach B1 (R&B singer Barry White was able to drop down to G#1, and Adam Lopez can reach A#1). It is essentially the lowest note written in choral music, with some exceptions (notably Rachmaninoff's Vespers and Gustav Mahler's Symphony #2). Just as music is seldom written higher than F6, neither is it often written lower than C2.

However, Russian Choral music has been known to feature basses who can sing an octave lower than this. Yuri Wichniakov sings a C#1 in "Do Not Reject Me In My Old Age". The timbre of the Russian Basso Profondo resembles that of the low notes of an organ.