Nostalgic clip, featuring Eminem and Skylar Grey, reflects on producer/rapper’s career. By Alvin Blanco Dr. Dre Photo: Johnny Nunez/ WireImage Dr. Dre is back on call. The veteran hip-hop producer, rapper and executive debuted the video for “I Need a Doctor,” the second single from his highly anticipated third solo album Detox. The video opens up with Dre reminiscing about his career. While driving, he gets into a severe car accident, leaving his prot