If Akiko wanted to show someone singing a song published between 1964 and 1977, what would she need to know to determine whether the song is in the public domain and free for use?

Whether the work was published with notice or not

Whether the work was published under the author's name

Whether the work was published prior to 1923

What are three options for using incidental background music in a documentary?

Assert fair use and keep the music in the film, find the rights owner and ask for permission, and overdub the copyrighted music with something that is in the public domain.