Is the song Oklahoma in public domain?

The song "Oklahoma" from the musical of the same name was written by Richard Rodgers and Oscar Hammerstein II and premiered in 1943. As the work was published after 1923, it is still under copyright protection. Copyright laws generally protect works for the life of the author plus a certain number of years (usually 70), meaning "Oklahoma" is not in the public domain. Therefore, it remains protected until at least 2039.