The work that Joe Pass did with Ella Fitzgerald stands as some of the best music ever made by only two people. There were four albums, all on the Fantasy/Pablo label. "Take Love Easy" was released in 1973. "Again" came out in 1976. "Speak Love" was released in 1982, and "Easy Living" in 1986.
If you want some music to help you relax, go get any or all of these masterpieces.