Rowlf and Gladys Knight remember Fat Mamma Jefferson.
Fat Mamma Jefferson was a blues composer who wrote a short piano piece played by Rowlf as a prelude to "God Bless the Child" in episode 516 of The Muppet Show. In warming up for a number with Gladys Knight, Rowlf cites her as his favorite blues singer.
Gladys doesn't remember her right away, until Rowlf explains that she was a spotted basset hound. Then Gladys recalls that she's the one who wrote the classic, "I Won't Hang My Head In Shame 'Cuz I Step On My Ears When I Do."