For many people, "backing" automatically connotes "bass", and, in folkish circles, "upright bass" in particular. Pick any handful of studio-musician-backed albums cut between the early 70's and late 90's and one or more will feature the bass work of either Roy E. "Junior" Huskey or his son, Roy Huskey Jr. (Don't let the names confuse you: "Junior" was the dad's nickname - Roy Jr. was the son.) Those guys played with practically everybody: John Hartford, Emmylou Harris, Norman Blake, and on both of Nitty-Gritty Dirt Band's "Circle" albums, just to name a few. Sadly, Junior Huskey died in '92, and Roy Jr. in '97.