I have a song from the early 1900s that apparently is now reverted to the public domain. I hope to use it in a short film I am producing. From this website http://www.pdinfo.com/pd-song-list/ it appears that this means the sheet music is "public domain", not any recordings, I assume. How can I confirm that it is OK for me to commission or record my own rendition of this song without violating any copyright? If there are any experts out there, I hope you can chime in. Thanks.