Massive Attack: Mushroom, 3-D, Daddy G. Additional personnel: Sinead O' Connor, Horace Andy, Robert Del Naja (vocals); Angelo Bruschini (guitar); Skaila Kanga (harp); Stuart Gordon (violin); Jon Harris (bass); Damon Reece (drums). Producers: Robert Del Naja, Neil Davidge. After a five-year gap, the follow-up to 1998's lauded MEZZANINE finds Massive Attack picking up right where they left off, as though no time had passed at all. The trademark mix of downtempo electronica, slithery trip-hop,