Sing along with your friends to all your favorite songs in Let’s Sing 2015! Enjoy five exciting game modes: Solo, Duet, Battle, Co-op and the all-new Surprise! New ‘Surprise’ Game Mode Let’s you sing without the support of the music at surprise intervals. It also includes two sub modes of increasing difficulty level: By Heart: No lyrics A Capella: No lyrics and no audio Game mode is available for each of the 42 songs.