When you're dealing with this level of accomplishment, generations mean nothing. The Impossible Gentlemen are four musicians: pianist Gwilym Simcock (30), guitarist Mike Walker (48), drummer Adam Nussbaum (55) and bassist Steve Swallow (70).Each one is a virtuoso, but that's taken for granted. It's the interplay between them that matters, the way every nuance fits magically into the ever-changing pattern. And it's not all action and energy either; the duet between Simcock and Walker in "Gwil's Song" is the most sensuous sound imaginable. Absorbing.