Recently I heard that the patents on the MP3 format have been released. I'd think that means MP3 will be more widely supported, in open-source software and such. But I've seen some articles that are trying to say the MP3 format is "dead": https://qz.com/983934/say-goodbye-to-the-iconic-mp3/ That article says there are newer formats (such as AAC) that offer better audio quality. It makes sense to me that the newer/better formats would be preferred, but it doesn't make sense to me to call MP3 dead right now. Many devices on the market, including car stereos, smart phones, music players, etc. support MP3; I haven't heard of any such devices that support AAC, although I have no doubt that there are smart phones etc. that support AAC (it would just need a music player app that plays AAC). Devices like car stereos are harder to update, so I imagine there may still be many such devices for a while that can play MP3 but not the newer formats. Basically, I think it's going to take some time for some music players to catch up with newer formats. After MP3s came out, it was several years before I saw a car stereo that could play MP3 files. Also, I imagine that it would take an audiophile's ear to really notice the difference between a high-quality MP3 and an AAC file. I doubt many people with MP3 files are going to go re-rip all their music to AAC right now. Some music sold online is in MP3 format - I'd hope that same music would become available in newer formats once available. That's one reason I still prefer to buy music on CDs or in FLAC format - I can convert it myself to whatever lossy format I choose.