Hi Maddy,
You can download the free Notation Player and install it on Mac.
Please see our Mac installation guide at
www.notation.com/MAC.php and the free download of Notation Player can be had at
www.notation.com/DownloadNotationPlayer.php
That will let you hear and see the song file, as opposed to just seeing it via PDF. PDF can also be exported from Composer and Musician.
Enjoy,
Sherry