The term 'VEXATIONS Composer' refers to the French composer Erik Satie (5 letters). Satie was a prominent figure in the late 19th and early 20th century Parisian avant-garde, and is best known for his compositions of piano music. He is also remembered for his composition 'VEXATIONS', which consists of a single short theme repeated 840 times. Satie's full name is Erik Satie (9 letters), and he is widely considered to be one of the most influential composers of the 20th century.