THE SIMPSONS: Homer and Marge in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX

THE SIMPSONS: Bart and Hettie (guest voice by Kate McKinnon, Natalie Maines (singing) in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX

THE SIMPSONS: Bart, Lisa and Hettie (guest voice by Kate McKinnon, Natalie Maines (singing) in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX

THE SIMPSONS: Lisa and Hettie (guest voice by Kate McKinnon, Natalie Maines (singing) in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX

THE SIMPSONS: Hettie (guest voice by Kate McKinnon, Natalie Maines (singing) in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX

THE SIMPSONS: Bob Boilen guest voices as himself in the “Gal of Constant Sorrow” episode of THE SIMPSONS airing Sunday, Feb. 21 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2016 TCFFC ALL RIGHTS RESERVED. CR: FOX