The king had almost 50 original compositions to his name, including Candlelight Blues and Falling Rain.
Bhumibol started learning the trumpet while studying in Switzerland as a youngster, and after ascending to the throne in 1946, he formed a 14-member jazz band in his Bangkok palace, which broadcast live performances every Friday.
His band focused more on swing tunes from the Big Band era, instead of the more avant-garde sounds of the likes of Miles Davis and John Coltrane, and as the king aged they moved their regular jam sessions from Bangkok to more infrequent sessions at the summer palace in Hua Hin.