If you do not have a way to upload songs files use Filezilla. You can download it to your PC using https://wiki.filezilla-project.org/Download. Load all songs to the 'media' folder. Try uploading a few songs to see how it works. Then create a playlist for them, add songs individually to each playlist you created, and assign a time for them to play. They will automatically play at a certain time. More info on this is at: http://www.internetsolutions101.com/members01/knowledgebase.php?action=displayarticle&id=4.
When you have this working you can add more songs using FTP and add them to a playlist.
