OK thanks....will try
but I had JRiver on anther laptop and the m4a and m4p files all played...quick time was installed, but the Options Setting was "Automatic"
I toggled the "Options-FIle Type Setting" to "QuickTime", but the m4p song/music would not play. The 'blue ribbon' showed that it was playing, but no sound!
eventually it just moved on to the next song, which was m4a, and it played successfully