On Monday, Sony will release rhythm & blues group Naturally Seven's new CD in Germany with a so-called "second session." The disc can be played on almost any device conventionally, said Sony Music Chief Technology Officer Phil Wiser.
It also contains a compressed digital copy of the music that can be quickly copied onto any computer. From the computer, users can copy that music onto Sony portable digital music players.

The CD's also allow users to connect to Web sites with exclusive features such as bonus songs and concert tickets. The features are only available if you have the original CD.

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