The Stooped-Over Fiddler is a fiddler with horrible posture.
When the Simpsons were at Lazy I Ranch, Lisa saw a poster advertising the ranch's Western Dance, with a sign "The Stooped-Over Fiddler is back!" Later, he was seen in the background at the dance, along with other musicians, playing the fiddle. When Maggie was tossed through the air by the dancers, her clothes got caught on the fiddler's bow. However, he didn't seem to notice it and kept playing the rest of the song.