1) a type or category of literary work such as comedy, tragedy, novel, drama etc (genre)
2) (Latin) a great literary work, especially a person's chief literary work (magnum opus)
3) a literary work or work of art using different styles or one in the style of another (pastiche)
4) the act of writing something, especially a book; literary work (writing)
a musical composition for one or more solo instruments supported by an orchestra
written or musical creation