Mos Def had to duck out of his scheduled performance at U.K.'s Glastonbury music festival this weekend to tend to a death in the family.

The rapper was to perform twice during the renown three day fest -- a Friday night solo set on the West Holt stage and a guest appearance with headliners Gorillaz on the famed Pyramid Stage. Instead, Nigerian-born soul-hop singer Nneka will takeover for Mos Def's solo set, while no word on if or who will replace him with Gorillaz. Mos Def raps on the band's single 'Stylo' off their latest album 'Plastic Beach.'