On Thu, 4 Apr 2019 15:42:50 +0000 (UTC), Isidore Goresky wrote:

Isidore Goresky wrote on Wed, 3 Apr 2019 22:15:10 +0000 (UTC)
Do I maybe have to convert the MP3 files to WAV or something first?

ISTR that that's what you have to do, if you want the music to be playable
in a standard CD player. You also have to consider the playing time of the
mp3 pieces. You won't get more playable music on a playable CD (music data
themselves, yes, but not playable music) than the CD allows (by its playing
time).

So, if you burn three times as many mp3 data on CD (because mp3 is perhaps 3
times less data), the CD will most likely be unplayable because the burning
process can't be finished correctly (can't remember exactly, though).