The term 'SINGER's Syllables' refers to a set of eight syllables used in solfège, a system of music education used to teach sight-singing. The syllables are TRAS (4 letters), SOLS (4 letters), LAS (3 letters), FALA (4 letters), LALA (4 letters), REMI (4 letters), LALAS (5 letters), SOLFA (5 letters), TRALA (5 letters), and TRALALA (7 letters). These syllables are used to represent the notes of the musical scale, allowing singers to learn melodies by sight.