NOTE: Gameplay requires a USB microphone. Game does not include a USB microphone with rental or purchase. Sing4 gives you a Top 40-worth of hits to sing along with and all the tools to make you sound like a chart-topping sensation. The game scores your performance with ultra-sensitive technology smart enough to detect whether you are singing or humming. Choose from 40 officially-licensed popular songs and music videos. Give your voice a boost with vocal enhancers that help you stay on pitch and in tune, or have fun with oddball effects like "helium" and "ogre." Up to four players can perform together in Solo, Co-op, Duet, or Battle Modes. To make sure no one misses your show-stopping skills, you can record your performance and replay it any time you want.