MP3 has been around so long that it works with damn near everything, and the last patents expired in 2017, so it's now a completely free and open standard. If

MP3 has been around so long that it works with damn near everything, and the last patents expired in 2017, so it's now a completely free and open standard. If you don't care too much about file size (LAME -V0 is ~256 kbps), it's a decent option for many purposes.