I love Pond 5 and use it nearly every day for work. I spend a decent amount of time searching for music, and thus, I'm very familiar with searching for a type of song using a keyword and then being confronted by 40,000 search results. This isn't really much more helpful than just blindly browsing random genres, especially since many of the songs that are brought up have nothing to do with the style I'm looking for.
My suggestion? Limit each song to only having 3 keywords associated with it. Most of the songs that are brought up currently have dozens of keywords. I think people do that because they assume the more keywords they use, the more likely they are to have people land on them, even by accident. This is silly because sellers naturally start shotgunning keywords onto their songs whether they are relevant or not. And that's why searching using keywords is almost totally useless on Pond 5, when it could quite easily become the most powerful feature on the site.
Limit each song to 3 keywords only, and suddenly each artist has to choose carefully how to describe each song. Some might even pick up a thesaurus now and again because the more accurately and specifically they can describe the song, the more likely it will be for them to reach their target audience and separate themselves from the other 40,000 dummies who, under other circumstances, would attach every single adjective they know to every single song they upload. This would, in turn, make my job a whole lot easier, because whenever I search for "prehistoric dinosaur swamp" the search will return 4 or 5 songs that are exactly in the genre I'm looking for instead of tens of thousands of seemingly random songs that only serve to frustrate and get in the way.