No, the T3 does not play MP3...as far as I know, the S910 is the first Yamaha arranger to play MP3 (it also plays Wav).

Mind you, it records only in Wav, and you must convert to MP3 in your PC.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.