TTBB
Encyclopedia
In musical choral notation, TTBB denotes a four-part men's chorus
Men's chorus
A men's chorus or male voice choir , is a choir consisting of men who sing with either a tenor or bass voice, and whose voices are arranged into high and low tenors , and high and low basses —and shortened to the letters TTBB...

. Its configuration is Tenor
Tenor
The tenor is a type of male singing voice and is the highest male voice within the modal register. The typical tenor voice lies between C3, the C one octave below middle C, to the A above middle C in choral music, and up to high C in solo work. The low extreme for tenors is roughly B2...

 1, Tenor 2, Bass 1 (Baritone
Baritone
Baritone is a type of male singing voice that lies between the bass and tenor voices. It is the most common male voice. Originally from the Greek , meaning deep sounding, music for this voice is typically written in the range from the second F below middle C to the F above middle C Baritone (or...

), Bass 2.
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