A profile of Justin Timberlake:

This need to succeed, to become his generation’s multi-talented Sammy Davis Jr., is part of what makes him appealing to filmmakers. “I needed someone who could be a Frank Sinatra figure, someone who could walk into the room and command all the attention,” says David Fincher, of casting Timberlake as Sean Parker, the Facebook investor and rogue, in The Social Network. “I didn’t want someone who would just say, ‘I know how to play groovy.’ You can’t fake that stuff. That’s the problem with making movies about a rock star—actors have spent their lives auditioning and getting rejected, and rock stars haven’t.”