Final answer:
Coleman's unorthodox quartet included a saxophone, trumpet, bass, and drums, which was unconventional for its time and contributed to the development of free jazz.
Step-by-step explanation:
The unorthodox quartet made up by saxophonist and composer Ornette Coleman featured an unconventional lineup of instruments. Rather than the standard jazz quartet setup of piano, bass, drums, and horn, Coleman's quartet was unique for its time and consisted of a saxophone, a trumpet, a bass, and drums.
This departure from the norm was both innovative and influential, helping to give rise to a new genre of jazz known as free jazz, where musicians could depart from fixed chords and rhythms to explore improvisation more freely.