In a Grammy acceptance speech earlier this year, Natalie Maines of the Dixie Chicks quoted Nelson from The Simpsons (“HA ha!”). Now she and her bandmates are becoming even more animated: They recorded a guest spot last month for the Fox comedy. The story line involves the return of country singer Lurleen Lumpkin (Beverly D’Angelo), who is reunited with her father. Alas, her father swipes one of Lurleen’s songs and sells it to the trio. When the Chicks find out about his scam, well, let’s just say they’re not ready to play nice. The episode is slated to air in the spring.