After "Le Grand Macabre", Ligeti struggled for some time to find a new style. Besides two short pieces for harpsichord, he did not complete another major work until the Trio for Violin, Horn and Piano in 1982, over four years after the opera. His music of the 1980s and 1990s continued to emphasise complex mechanical rhythms, often in a less densely chromatic idiom, tending to favour displaced major and minor triads and polymodal structures. During this time, Ligeti also began to explore alternate tuning systems through the use of natural harmonics for horns (as in the Horn Trio and Piano Concerto) and scordatura for strings (as in the Violin Concerto). Additionally, most of his works in this period are multi-movement works, rather than the extended single movements of "Atmosphères" and "San Francisco Polyphony".