What audio format can work in sony cd players, and the car cd player?

The only think that works in all players is regular CD-audio, where you burn a CD with tracks. Some players will read MP3 files off of a CD-R, but since we don't know what kind of players you have, this is not guaranteed. CD-R's are cheap, you could just try it and see.

Very ancient CD players may not work well with CD-R, but that would have to be something really old, like from 1990.
 
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