Ethan Hawke’s transformative turn in “Blue Moon” - the actor’s first film in a decade with long-time collaborator Richard Linklater - just brought the house down in Berlin. The audience at the Berlinale world premiere were hugely positive for the biographical musical drama,

Berlin: Ethan Hawke and Richard Linklater on their new film 'Blue Moon,' in which Hawke plays American lyricist Lorenz Hart.

Few film-makers have as varied a CV as Richard Linklater's; from the box-office hit School of Rock to his experiments with rotoscope, he is indefatigably curious and surprisingly consistent - with style and substance.