Biophilia : ★★★★☆

Björk has spent six albums twisting organic sounds and galactic transmissions into parallel-universe pop, with results both classic (1997s Homogenic) and confusing (2007’s murky Volta). Biophilia is rife with drum-and-bass breakdowns and Casio blurps — an ingenious marriage of faerie and machine (including the accompanying iPad apps). But the singer’s greatest strength remains the glistening natural resource flowing from her throat. A-