It is almost exactly a quarter of a century since Pierre Boulez recorded his complete Webern survey. This new collection, apart from being useful for anyone who doesn't want to buy three whole CDs of Webern, offers an interesting insight into how Boulez's way with a composer probably more central to him than any other has changed. For a start he gives him a little more time: most of the pieces here are slightly but significantly slower than they were in 1970. This allows lines to be more subtly moulded, phrases to acquire a touch more poise. This is not to say that Boulez has softened and now phrases Webern as though he were Chopin, but grace and even wit (the second movement of the Quartet) are now noticeable alongside his customary precision. The Ensemble InterContemporain have been playing these pieces constantly since they were first founded, and it shows in the absolute assurance of their performances.