Eminem rarely does interviews, and a conversation about last night’s surprise performance of “Lose Yourself” at the Academy Awards — some 17 years after the song won him an Oscar — would seem rarer still. The performance in many ways was a belated do-over: He’d decided not to attend the ceremony in 2003, leaving his collaborator Luis Resto to accept the award — from Barbra Streisand, no less — in his place.