The technique of overdubbing can apply to any
sounds added to a
recording at any point after the initial "live"
instruments or
sounds have been
tracked to multi-track
tape (or disk).
It is virtually unheard of nowadays for a commercially released recording to contain no overdubs whatsoever (excepting of course most "live in concert"-type albums).
bitter_engineer: Fair point about Jazz albums. My generalisation above does fall down slightly when dealing with largely instrumental music.