I'm not too sure about Hilty & Bosch's background..but ima in Japan at da moment so II will find out some more soon! I actually had the pleasure of watching them perform in a local gig in my town (Yamagata) and let me tell you, when they freestyle, it's so different from any other style I've seen!!Both of them have their own seperate styles; it's really strange to watch... but cool at the same time...
Oh yeh, Bitter Box sisters were there too..It was Risa's birthday...Japnese people singing Happy Birthday in English is suitably strange...
Anways, ill b bac wit wit more info
Peace