"Bye Bye Birdie" (1961)
The songs aren't rock, but it was the first Broadway show to address rock 'n' roll: an Elvis-like singer (actually based on singer Conway Twitty) stages a big publicity event before he enters the army.
Most famous song: "Put On a Happy Face"
Legacy: The 1963 movie version marked the screen debut of Ann-Margret, who would play Mrs. Walker in the movie version of "Tommy."