Bert is a yellow Muppet character on the long running PBS and HBO children's television show Sesame Street. Bert was originally performed by Frank Oz. Since 1999, Muppeteer Eric Jacobson has been phased in as Bert's primary performer. Bert has also made cameo appearances within The Muppets franchise, including The Muppet Show, The Muppet Movie, and The Muppets Take Manhattan, in addition to an appearance with Ernie on The Flip Wilson Show on September 14, 1972, on which he sang "Clink, Clank", a song about noises. Jacobson joined Sesame Street in 1994.