LAS VEGAS (Billboard) - With a No. 1 debut for its current album "American Idiot," and now Tuesday's news of six Grammy nominations, Green Day has found itself back in the spotlight. But if the punk-rock trio has its way, its Reprise album may yet fuel a crossover into an entirely new medium. "We're definitely working on a film based on the album," bassist Mike Dirnt told Billboard.com ahead of the group's performance on Wednesday's Billboard Music Awards. "I mean, the story is already there. But to some degree, it will depend on who ends up doing the writing...