Real easy to listen to Western music in Japan. There's that thing about Japan exclusive tracks or albums just getting released in Japan before the rest of the world gets it. As far as Hiphop, every bigtime rapper you can name has done a concert in Japan (Ludacris just did one yesterday). And every year there's a 'Fuji Rock Festival' concert starring a lot of hi-profile rock bands. And Virgin Megastores and HMV seems to sell more western releases than domestic. Plus there are a few decent radio stations in Tokyo that plays mostly rock, pop, r&b and hiphop. So yeah, not hard at all.