I am out every morning, walking through a growing symphony. Every day new voices are added to the most wonderful of musical pieces. The form is the classic with three movements: fast-slow-fast. The first fast and cheerful movement with the Tits', the Robins' and the Song-larks' has been replaced by the slow and a bit more contemplative second movement of the Thrushes. Now it is time for the finale furioso; the Warblers enter center stage as the trees are in bud and the insects starts to appear. But not without the thrushes putting up a fight. The garden's unofficial first diva at present, a Songthrush with an impeccable feeling of form and divine improvisational and imitational gifts, who has been perching unopposed in the highest firtree has now got competition. I never had the chance to see the upstart but I think it was the Marsh Warbler who usually occupies the same part of the garden. And he too is an imitator of note, yes the "Zelig" of the bird wo...