How does licensing for digital downloads and interactive audio streams work?

Answer:

Cover Song Licensing
For digital downloads and interactive audio streams, you pre-pay for a certain number of downloads or streams up-front before you distribute. We suggest you license what you think you will sell in one year. It's up to you to monitor your sales and make sure you do not exceed what you have licensed. You can always come back and get a new license for additional units. If it's an exact re-order without changes, our fee is half-price. This makes it easy for you to license only what you need upfront and avoid paying too much in fees for reorders.

Custom Licensing
The license duration, terms, quantities, and territories will be established in the custom agreement. You can always come back to us and request a new license for additional units if necessary. For Custom Licensing, we must charge our full fee for every request, including reorders.
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https://www.easysonglicensing.com/pages/help/resources/music-licensing-question-with-answer.aspx