The Simpsons is going to welcome some top-notch guest voice talent in Sunday's episode.
SNL's Kate McKinnon lends her voice as Hettie, a homeless woman whom Bart befriends after accidentally sending her only possessions into the river. In spending time together, Bart soon learns that Hettie is a fantastic folk singer.
Natalie Maines lends her vocals for Hettie's singing parts, one of which is teased above in a clip you're seeing first on Mashable. It's a slightly moody sneak peek -- they even use moody black and white stills for the montage -- but the episode as a whole seemingly has its share of dramatic turns.
wLet's just say Bart and Lisa soon learn that Hettie's musical abilities are not her only secret. You'll see what we mean.
"Gal of Constant Sorrow” airs Sunday, Feb. 21 at 8 p.m. ET on Fox.