Gould was convinced that the institution of the public concert was not only an anachronism, but also a "force of evil", leading to his retirement from concert performance. He argued that public performance devolved into a sort of competition, with a non-empathetic audience (musically and otherwise) mostly attendant to the possibility of the performer erring or not meeting critical expectation. He set forth this doctrine, only half in jest, in "GPAADAK", the Gould Plan for the Abolition of Applause and Demonstrations of All Kinds. On 10 April 1964, Gould gave his last public performance, playing in Los Angeles, at the Wilshire Ebell Theater. Among the pieces he performed that night were Beethoven's Piano Sonata No. 30, selections from Bach's "The Art of Fugue", and Paul Hindemith's Piano Sonata No. 3. Gould performed fewer than 200 concerts over the course of his career, of which fewer than 40 were outside Canada. For a pianist such as Van Cliburn, 200 concerts would have amounted to about two years' touring.