Yattarouze! (やったろうぜ!; Let's Do It!) is the 2nd single by Ongaku Gatas. The single was released on December 5, 2007, in both limited and regular editions. The limited coming with a bonus DVD. The single V was released on December 19, 2007. The single reached #21 on the Oricon charts and charted for three weeks, selling 9,042 copies. The single V reached #12 on the Oricon charts and sold 3,715 copies. This is the last single to feature Muto Mika and Mano Erina.