Copland's compositions before leaving for Paris were mainly short works for piano and art songs, inspired by Liszt and Debussy. In them, he experimented with ambiguous beginnings and endings, rapid key changes, and the frequent use of tritones. His first published work, "The Cat and the Mouse" (1920), was a piece for piano solo based on the Jean de la Fontaine fable. In "Three Moods" (1921), Copland's final movement is entitled "Jazzy", which he noted "is based on two jazz melodies and ought to make the old professors sit up and take notice".