Rakim is one of the founding fathers of hip-hop, and has to be on the shortlist of anyone's cast of Best MC's of All Time. Younger acts are lauding his influence (see ASAP Rocky, born Rakim Mayers), and he takes to the road for this tour with Dilated Peoples' mainstay Evidence. The Observatory, 3503 S. Harbor Blvd., Santa Ana. 7 p.m. Sat. $20. Observatoryoc.com.