Who is the recent comedian who did a stand-up by singing 40s-style with a tape recorder?

The only part of it I remember is him sitting on a stool, holding up a tape recorder thats playing a 40s style song and singing along with it.
Who is the recent comedian who did a stand-up by singing 40s-style with a tape recorder?
Andy Kaufman. Did the whole Mighty Mouse routine that way, which was one of his signature acts.
Reply:Sounds like something Andy Kaufman would have done.
Reply:the late George Carlin .. R.I.P