Recently, the MP3 format had gone obsolete and some services like Soundcloud are using other file format for music instead. Game Maker Studio series uses OGG for music for some reason but that is one experienced example. Soundcloud seems to be doing the same but with different file format. There were complaints from people saying that the music quality is lower when converted from MP3 to other file format in lower quality. Couldn't Soundcloud retain the same frequency and bit-rate when doing that conversion?
The expiry of MP3 file format is probably due to the expiry of the patents and you can look it up in Wikipedia as the patent story behind this file format is quite long in terms of history.
The files in MP3 file format can still be used today but then, who knows what kind of future plans will be when it comes to alternative file format like using OGG or WAV files for clearer music. Obviously, if you're going to be a professional music producer, you'll probably expect a professional and clean quality music with higher bit-rate and stereo sound.
