100th Window is the fourth studio album from the Bristol-based trip-hop group Massive Attack. Of the band's original core trio, the album only features Robert Del Naja. Andrew Vowles departed shortly after the release of Mezzanine, and Grant Marshall refused to participate in the making of the record.Released in February 2003, 100th Window was written and produced by Del Naja and Neil Davidge, and features vocals from Horace Andy, Sinéad O'Connor and Damon Albarn (performing as 2D).