What to do when you've no new material to record and your hits have already been re-issued a hundred times before? Simple - put your collected instrumentals on a single CD and promote it as a unique perspective on the artist's ever changing moods. A cynical move you might think, but in fact David Bowie's voiceless experiments have usually been so enthralling that the concept is hard to quibble with. From the glacial soundscapes of the Berlin trilogy to the Philip Glass collaborations of the 90s, this is a varied and mostly intriguing collection of avant-garde noodlings. Not the most essential Bowie album ever released, but the fact that it was possible at all confirms his status as pop's greatest chameleon.