1. musical composition, opus, composition, piece, piece of music -- (a musical work that has been created; "the composition is written in four movements")
1.
As a matter of fact, "Thus Spake Zarathustra", though it is unquestionably Nietzsche's opus magnum, is by no means the first of Nietzsche's works that the beginner ought to undertake to read. - from Thus Spake Zarathustra by Friedrich Nietzsche