Tristano studied for bachelor's and master's degrees in music in Chicago before moving to New York City in 1946. He played with leading bebop musicians and formed his own small bands, which soon displayed some of his early interests – contrapuntal interaction of instruments, harmonic flexibility, and rhythmic complexity. His quintet in 1949 recorded the first free group improvisations. Tristano's innovations continued in 1951, with the first overdubbed, improvised jazz recordings, and two years later, when he recorded an atonal improvised solo piano piece that was based on the development of motifs rather than on harmonies. He developed further via polyrhythms and chromaticism into the 1960s, but was infrequently recorded.