Singing Machine SMG900 3 Carousel Karaoke System 3-Disc Changer CD Player - Plays your music CDs & karaoke CD+Gs. Connects to Your TV - Display song lyrics on your TV screen. Dual Cassette Decks - For dubbing your performance. Digital Key Control - Adjusts music to your vocal range. Keyboard & Guitar Input Jacks - For use as an amplifier.