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MP3+g or MP3g is the karaoke version of the MP3. In order to utilize MP3 for Karaoke a second file is created which contains the graphics for the display of the lyrics. This has a .cdg file extension. Both files together form an MP3+g (sometimes MP3g) karaoke track. You can play these tracks on your computer using special karaoke software such as WinCDG or burn them to a blank disc in .BIN format and they will play as normal CDG karaoke discs.