After the public reported several bugs in the original Japanese version of Jet Set Radio, Sega decided to re-release it under the name of De La Jet Set Radio ("Deluxe" Jet Set Radio). This version was only sold in Japan via Dreamcast Direct (later renamed Sega Direct) making it one of the more rare Dreamcast titles available. The gameplay in this version was easier to pick up and included the added music from the European and US versions, including the two levels only included in these two versions. The text featured in the game is localized in the main language of your Dreamcast, unlike the original Japanese version, which means that if your Dreamcast system is set to English language, the text in the game will be in English. The same goes for Japanese, German, French and Spanish. However, the voices remain Japanese.
*note*
Basically the music has been ripped at a higher quality and re-packed into the iso. The original StoneArts rip had the worlds lowest music quality.
Credits: Pavlik