TTBB

TTBB is a vocal arrangement designation that stands for "Tenor 1, Tenor 2, Baritone, and Bass." It refers to a four-part men's chorus or vocal ensemble layout, where two parts are sung by tenors, one part by a baritone (which typically sings in a range between tenor and bass), and one part by a bass. This arrangement is commonly used in choral music, allowing for rich harmonies and varied vocal textures.