'Kon was more assured in his reverence for Dr. Dre. Last year's "Kush," the official lead single from Dre's long-awaited Detox album, featured a vocal from Akon. "Dre is one of those guys ... he's a perfectionist in his own [right]," Akon said.
"You feel confident working with him because he's not going to let nothing go undone. In a way, that's great. But sometimes you're anxious too, like, 'Man I can't wait to let everybody hear this.' Ultimately, working with Dre was just amazing. Dre is very picky about who he decides to work with too. For him to call me and do [multiple] tracks on the record and be involved in more than one record on that album, it said a lot. It shows how much he really appreciated what I'm doing."
Source - http://www.mtv.com/news/articles/1661852/akon-nick-cannon-famous.jhtml