There were modest flashes of hip-hop, from acts like the Roots, which imbued its set with jazzy abstraction, and the Somali rapper K’naan, who spent much of his set unspooling self-affirmative rhymes.
Saturday's lineup included K'Naan, a socially conscious Somali rapper, and the Roots, who showed off their musicianship with drum, guitar and even tuba solos...