The Clarinet Trio Transformations and Further Passages Jürgen Kupke, clarinet; Michael Thieke, alto clarinet, clarinet; Gebhard Ullmann, bass clarinet Leo Records LR 921   Gebhard Ullmann is celebrating his sixty-fifth birthday with the release of three albums, Transformations and Further Passages on Leo among them. The Clarinet Trio are a superb group of improvisers, Jürgen Kupke and Michael Thieke are eloquent foils for Ullmann. Unlike some other Ullmann outings, where he clearly leads the proceedings, this is a context in which everyone collaborates and gets to take solo turns. In fact, three of the tracks are solos, one for each