I know there probably aren't a lot of hip-hop fans here, but I thought it was worth posting anyway. Nate Dogg was T-Pain before there was T-Pain but without any of the gimmickry or computer tricks. Just a fantastic voice. The list of R&B singers and rappers who featured him on at least one of their songs is a who's who of R&B and hip-hop. He had a great voice, and he helped make a lot of fun songs.
The article points out that he was a former marine, a multiple time Grammy nominee, and an unfortunate multiple stroke victim. I don't think I saw cause of death or suspected cause of death, but I guess he wasn't in the best of health. Very sad.
AS far as Blues goes, the Robert Johnson is a must have. It sounds like they tried to make it sound crappy, but considering the source tapes they had, it comes out pretty good. For more modern, anything by BB King is essential.