Bye-Ya is a jazz tune by Thelonious Monk. It was first released in 1954 on the album Thelonious Monk Trio. The piece is a 32-bar AABA tune played over an Americanized Afro-Cuban 3/2 Son Clave groove, which becomes clearer in the second chorus. The head is fairly easy to learn, but rhythm and harmony pose significant challenges, including a IV-I plagal cadence at the start and a backdoor bVII-I cadence in bar five, with a smooth resolution in bars eight and nine thanks to careful voice leading. Some sources trace an earlier 1952 recording under the title Vaya, and the tune later appears on Monk's Dream (1963), recorded in 1962 with a quartet. Bye-Ya remains a distinctive example of Monk's modern jazz language, bright and playful on the surface yet intricate underneath.
