Banjo and Sullivan
From the film The Devil's Rejects (2005). This novelty 1970s country & bluegrass duo of Adam Banjo (Lew Temple) and Roy Sullivan (Geoffrey Lewis) are in Rob Zombie's sequel to House of 1000 Corpses. They mysteriously "disappear" (i.e. are brutally murdered by the film's title psychos).
They have their own website, http://www.banjoandsullivan.com.
They released a fake greatest hits album in 2005, Rob Zombie Presents... Banjo & Sullivan: The Ultimate Collection 1972-1978.