Question: What is the nationality of the principal conductor for the 2004 German documentary film Rhythm Is It!?
Sentence (from "Rhythm Is It!"): The film documents a project undertaken by the Berlin Philharmonic principal conductor Simon Rattle and choreographer Royston Maldoom who decided to popularize classical music by staging a performance of Igor Stravinsky's ballet "The Rite of Spring" with a cast of 250 children recruited from Berlin's public schools.
Relevant evidence: Yes