100th Window (2003)

There's a thin line between clever and torpid, to paraphrase Spinal Tap, and Massive Attack finally cross it on this drowsy return after a five-year layoff. Featuring only one founding member and absent the hip-hop traces of past albums, ''100th Window'' is a series of often stillborn soundscapes. Guest Sinead O'Connor can't decide whether she wants to parody herself (the simplistic, save-the-children rant of ''A Prayer for England'') or be alt-rock's Enya (her other, more placid contributions). Beautifully recorded, but so are most New Age records.