What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Here's how you can create your Order form with Jotform: Setting Up Your First Order Form. Basically, setup your product items with the MP3 Files names. After someone submits to the form and pay, you should be able to receive a notification. You could reply to the submitter with the download link of what they have purchase. Yes, a manual processed is involved.
You can also display a music player to your form by using one of our music widgets: http://widgets.jotform.com/search/music.