Rhythm Heaven, one of Japan’s hottest videogames, came from an unlikely collaboration between Nintendo and a high-profile Japanese music producer who set out on a quest to create a truly musical game. Mitsuo Terada, a 40-year-old J-pop producer who goes by the Prince-like moniker "Tsunku?," is involved in most every aspect of the Japanese pop […] Rhythm Heaven, one of Japan's hottest videogames, c