Happy Birthday to You

The classic birthday song "Happy Birthday to You" was used on both Sesame Street and The Muppet Show.

The Muppet Show

 * Sung by Animal and The Swedish Chef to Helen Reddy on episode 313
 * Sung by Linda Lavin and the Muppets to Kermit on episode 406

Sesame Street

 * Sung by the cast on the album Happy Birthday from Sesame Street.
 * Big Bird writes a new version -- "Rotten Birthday to You" -- in the storybook Oscar's Rotten Birthday.