The Three Sounds continued recording through the 1960s with Verve, Mercury, and Limelight up until the group disbanded in 1973. Harris was in effect retired in the late 1970s, although he played locally to his home in Boise, Idaho. He returned to touring and playing in the 1980s after Ray Brown convinced him to join his trio. He recorded with Brown and as a leader until his death from kidney failure.
One of my favorite Gene Harris performances is a Ray Brown LP called Summer Wind (Concord, 1988), a recording of a live date at Santa Monica's Loa Club. Here, Harris is featured on several numbers, including terrific versions of Li'l Darlin'" and Can't Help Lovin' Dat Man" (from the Broadway classic Show Boat). Here is the same lineup, with the addition of Herb Ellis on guitar, performing Oh, Lady Be Good" during an appearance in Berlin in 1989.