Willie Ruff, who fashioned an unlikely career in jazz as a French horn player and toured the world as a musical missionary in the acclaimed Mitchell-Ruff Duo while maintaining a parallel career at the Yale School of Music, died on Sunday at his home in Killen, Ala. He was 92.

His death was confirmed by his niece Jennifer Green.

Mr. Ruff, who was also a bassist, played both bass and French horn in the duo he formed with the pianist Dwike Mitchell in 1955, which lasted until Mr. Mitchell’s death in 2013. They opened for many jazz luminaries, including Duke Ellington, Miles Davis and Sarah Vaughan; played countless concerts in schools and colleges; and toured foreign countries where jazz was little known or even taboo.

In 1959, they flouted edicts against music that the Soviet Union deemed bourgeois, performing an impromptu set in Moscow while on tour with the Yale Russian Chorus. Their concerts in China in 1981 were considered the first jazz performances there since the Cultural Revolution.

A globe-trotting musical career, however, seemed a remote possibility when Mr. Ruff was growing up in a small Southern town during the Great Depression.

He was born on Sept. 1, 1931, in Sheffield, Ala., the sixth of eight children of Willie and Manie Ruff. “We lived in a house — my mother and eight children — that had no electricity, so there was no radio or music,” he said in a 2017 interview with Yale. “But there was always dancing, to silence. The dances made their own rhythm.”