Gould rejected most of the standard Romantic piano literature by Chopin, Liszt, Rachmaninoff, and others, in favour of Bach and Beethoven mainly, along with some late-Romantic and modernist composers. Although his recordings were dominated by Bach and Beethoven, Gould's repertoire was diverse, including works by Mozart, Haydn, and Brahms; pre-Baroque composers such as Jan Pieterszoon Sweelinck, William Byrd, and Orlando Gibbons; and 20th-century composers including Paul Hindemith, Arnold Schoenberg, and Richard Strauss. Gould was known for his eccentricities, from his unorthodox musical interpretations and mannerisms at the keyboard to aspects of his lifestyle and behaviour. He stopped giving concerts at the age of 31 to concentrate on studio recording and other projects.