A veritable Who’s Who of popular solo musical artists appeared on The Muppet Show as guest stars. These included Judy Collins, Lou Rawls, Loretta Lynn, Helen Reddy, Crystal Gayle, Arlo Guthrie, and Anne Murray. Joan Baez, singer-songwriter and social activist, joined the list at the start of the fifth (and final) season. In a very (very!) loose nod to Baez’s civil rights work, the episode’s action revolves around an effort by a group of rats to infiltrate the show. While concerned more about their access to the refrigerator than their equal rights, the rats do convince Kermit that they should be part of the group, despite being pests, and join in Baez’s performance of “Will The Circle Be Unbroken”. Baez, however, warns Kermit that rather than being downtrodden, the rats were actually trying to take over the show. The closing bears this out when the rats appear dressed as Kermit and Miss Piggy.
Given Baez’s legendary status and the fact that her performances tend to support causes rather than just be pure entertainment, the public relations people felt obliged to include her reasons for wanting to do the show in their promotional material. “Yes, it is an extraordinary thing for me to do,” Baez explained in the press release. She continued, “But this show has a touch of class. It’s intelligent, touching and it’s comfortable to do.” She also revealed another compelling reason: “I have a soft spot for Miss Piggy: she’s something else. I pleaded to be given a scene with Miss Piggy.”