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Creating this kind of form is possible, but I would say it's a bit complicated. Especially, if you are offering multiple music options to the form.
The idea would include our conditional logic feature. Let's say that if someone selected two music options, only send the two music download links.
Maybe, a workaround would be to just create the form with those music options. After someone sent the payment, send back the download links manually. This should work, but defeats the automation process.