Since it appears this happened 8 years ago, and uh, I can't say that I've seen a single MP3 file since then, perhaps nobody still cares.
If you're building a music library, and you're NOT using some sort of lossless format, I'd love to know why. I know a lot of people with massive libraries, medium libraries, and just shit they like one song at a time and not a one of them isn't using FLAC files for it.
They might transcode into something occasionally, but it's always something like AAC or OPUS, not MP3.