Katey Sagal, just in case you don't know, is also a professional singer and has worked as a back-up singer, most notably with Bette Midler's backup troupe, "The Harlettes".
Kelly is pretending to play an OVATION CC48 Celebrity Deluxe 6 String Orange Sunburst Guitar.
This episode marks Tammy Wynette's final live acting credit, before her death at age 55 in 1998. She did voice-over work in two episodes of "King of The Hill" in 1997 &1998.