Depending on the age of the player you can usually still add new music to an MP3 player. New ones, especially Android players, will be able to download directly from the internet or a network storage over wi-fi. Older players may not have this ability, and so connecting it to your PC or Mac may be the best way. These devices may appear as hard drives on your desktop and you can just drag and drop, or you can try iTunes or a third-party app like MediaMonkey.

Yes! There are new models released regularly. They're not nearly as popular as they once were, of course, but there are great options at a variety of price points. For instance, Sony still sells MP3 players under the Walkman branding, while HiBy, Shanling, Astell&Kern, and Fiio are some other big names.

MP3 is a compressed format and the bit-rate determines how much lossier it is than the original source, which is usually a CD. For many people, 320kbps is indistinguishable from lossless and is the "best case scenario" for ripping in the format. However, modern MP3 players can play other file types as well including lossless FLAC, ALAC and WAV.