Linking a song to a PDF file
Choose Play iTunes Song access your iTunes Music Library.
Choose between your Playlists, Artists, Albums or Songs. Select a song to play by pressing it. The song should start playing.
Press the Back button on the top left to go back to the Music Controller.
Press the link icon in the Music Controller to link the currently playing song to the PDF.
Note that you can link a different song to each page of a PDF.
Every song that you link should have a name and artist defined in iTunes.