Rivers Cuomo isn't a stranger to throwing us some curveballs. The latest: an album, the majority of which is in Japanese, with the lead singer of Alister, Scott Murphy. They've teamed up to create "Scott and Rivers". Rivers has long had a love affair with Japanese culture, and he's also married to Kyoto Ito Cuomo. He ran across Scott Murphy when Weezer was doing a tour of Japan. Both men are fluent in Japanese.
The album is currently available on iTunes, but here's a preview of one of the songs in Japanese.