How to get a MP3 DVD to play on Sony AZ5D .?

Hi,

I have a Sony DHC-AZ5D Hi-Fi system .
I downloaded many song albums in mp3 of the latest movies .

I then Burnt those folders ~ 2.8 gb on a DVD using Nero 11, making a Data DVD with all the MP3 folders having MP3 songs in them .

Then i tried to play it on My Sony AZ5D player , but it said Cannot play Disc .

Why is that .? And how can i get an MP3 dvd to work on my Player .?

Plz help ...