In the DVD Players compatibility list, there is a column for indicating MP3 compatibility. Is it referring to the DVD player's ability to play CD-R or CD-RW that have been burned with MP3s (in normal data file format), or is referring to some other media type?

I'm considering purchasing a Pioneer DV-333, but according to the chart it can't play MP3. I want to make sure this doesn't refer to CD-RWs burned with MP3 files.

Thanks