Why do you need songs that move seamlessly from start to end without, for example, a fadeout? Doesn't make sense to me :/
As for mp3 files, I read similar tests that stated the opposite. Maybe though the ones I read were outdated - using the older ogg encoding. So my bad there.
And please tell me though, what's the urgency to have the files now? Wouldn't it be better for me to just upload a .zip with all the files in one go when you need them (faster), in the file format you need so that you won't have to re-compress them and kill the quality (better)?