I have an idea which is possible to do and may be easy.
As you know if you link to any .mp3 files in a post in wordpress, wordpress automatically will add that link to .mp3 in a custom filed which is called enclosure. IF you link to 100 files, then 100 custom fields will be created.
See the screenshot:
I request you to make an option which can automatically take all these mp3 links and put them in the playlist for the specified post.
Is it possible?