Hi qtpros and orenlebbo,
Sorry for the extremely delayed response! Carlo and I have been working hard on Audiobar and it's sometimes hard to get to the forums.
Audiobar will only play content that's listed on the front page of your blog. Any mp3 files you link to on your front page (by either just posting the URL or hiding the URL with <a href=""> tags) will show a PLAY button next to them and, when clicked, it will play just that one song. If there is more than one song on the page, you will have to play each song manually.
Does this answer your questions?
We are currently working on playlist options and hopefully that will come to fruition soon...
Thanks,
Chad.