In a piano piece by this composer, increasing rhythmic divisions build into a rapid quintuplet ostinato to depict a chase. That piece by this composer opens with ultra-low clusters imitating “Drums and Pipes.” The last seventeen measures of this composer’s third piano concerto were finished along with his viola concerto by his student (15[1])Tibor Serly. (15[1]-5[1])This composer’s (15[1])slow movements often employ atmospheric imitations of natural sound in a (*) “night music” style. (10[2]-5[1])An “interrupted (10[1])intermezzo” appears in a piece by this composer whose second movement assigns different intervals to pairs of instruments. This “father of (10[1])ethnomusicology” used an Edison machine to collect field recordings with his compatriot Zoltán Kodály. For 10 points, name this Hungarian composer of a Concerto for Orchestra. ■END■ (10[2])