CD+G is commonly known as CDG. It's a compact disc that lets you play both the song and its lyrics. You can view the lyrics on an additional device, such as a television, laptop or PC. Many have echo control, which helps to balance vocals and make karaoke more enjoyable.CD+G, despite having advanced features and lyrics, can still be used as regular compact discs when they are inserted in a standard CD-player. This format is not supported by all karaoke systems, however, some home karaoke devices, such as the Singing Machine, do support it.