Since debuting with the raw, sparse Dry in 1992, singer/guitarist Polly Jean Harvey has become one of rock's premier shape-shifters, revealing new inspirations and testing different approaches with each addition to her catalogue. The gently harrowing waking-nightmare chronicle “When Under Ether” might stand in stark contrast to the guitar-heavy agitpop of “The Wheel” and the swaggering urgency of “50ft Queenie”, but Harvey's questioning spirit, subversion of expectations and willingness to press past her limits unites her disparate, thrilling body of work.