Tabby, the Simon And Garfunkel song is entitled "The 59th Street Bridge Song(Feelin' Groovy)". Even though they sing "feeling groovy", they don't mention the 59th Street bridge. A group known as Harper's Bizarre recorded a hit version in 1967. Gats, I had to research "Superstar". It was written by Leon Russell, and Bonnie Bramlett. The earliest version that I know of, is Rita Coolidge singing it on the 1970 Joe Cocker album "Mad Dogs And Englishmen". The Carpenters had a hit with it the following year. Another Nirvana song that doesn't have the title in the lyrics, is "Smells Like Teen Spirit".