Not crazy at all. That’s what most music libraries do instead of “top seller” lists. Using the source files spot for creating a new section dedicated to playlists seems like a good idea. Putting them squarely on the front page and pushing them as the main showcase would be even better.
Go to any major music licensing site and you will see playlists being emphasized, not e-commerce style top seller or featured lists. In fact, I would remove the top seller and featured track lists in favor of playlists. Lists based on sales influence the customer into licensing specific songs. Because they are placed upfront, they get more exposure and continue to sell over and over again. Hence, there’s an unnatural “trend” caused by the fact that many customers will just buy from that list rather than search a labyrinth of tracks all named Epic, The Epic, The Epicness, etc - with no upfront descriptions. Top seller lists also influence composers to keep writing the same cookie cutter tracks over and over again. They are just bad all around and I’d eliminate that and long term featured tracks that stay on the front page for weeks. For music licensing purposes, these type of lists cause uneven sales, and hinder composer creativity. They basically hurt more than they help. If you must have a monthly top seller list, I would just make it another playlist and put in the proper perspective. Some top libraries have done that. Just make it one of many playlists, and NOT the first playlist.
Playlists aren’t pushing specific songs as much as offering suggestions of what could work for specific needs, regardless of how well they may have sold in the past. They can either be curated or randomized. I would go with randomized on sites where all the music is already well curated and there are no lame tracks in the library. I’d go with curated if that’s not the case and the site needs to showcase their best tracks within the playlist categories. BUT, I wouldn’t leave a playlist with the same tracks for more than a week at a time and I’d randomize the order.
As for natural trends, they change, don’t they? Does that happen because the customers all suddenly decided they like a handful of songs on one licensing site, or because they heard something new that was good and started appearing in other productions? For them to hear something new, you have to show them new material, not the same material over and over again. Rotating playlists not only do that, they also work as helpful search aides. And when you site is more helpful to customers, you get more customers and more sales.
Here are some navigation examples from major music licensing sites: