I just thought I would weigh i on this one, whilst Songtradr aren't perfect by any means, they do have a lot of good points, there is a 2 stage process where the submissions are reviewed, move to shortlisted, and then reviewed again and if suitable go to final selection where they are sent to the music supervisors. We have had loads of tracks reach the final selection stage which we see as a good indicator of the quality, and if they aren't chosen by the music supervisor its because they weren't quite what they wanted, not that the song wasn't good enough.
There are larger companies using Songtradr, and they don't always use the submission system, we had a license from Toyota come out of the blue, we have found that its really important to use the descriptions and metadata to ensure the tracks are discovered by the search engine on the site.
There is a free account available where you get less credits each month which are used to pay for the submissions to the deals, but you are able to purchase more credits if required, with the paid for pro account you are given plenty of credits each month. There is also a lower percentage fee taken for each deal which is successful, and the pro account also includes distribution to Spotify, iTunes etc.
I don't wish to sound like an advert for them, but we have found that they are one of the better sites for licensing at a reasonable cost, and we have investigated quite a few.
Another benefit we have recently discovered is embedding the tracks, we have built a website and embedded all of the songs from Songtradr, so you can play the song and license it direct from our site, and all the legal stuff is dealt with by Songtradr.
Back to the original point, there has been a massive drop in the deals since the coronavirus pandemic arrived, due to the fact that no-one is producing anything at the moment, we can only hope that they will be an upsurge in people wanting music when the industry returns to normality.