there often would dairon sit upon a tussock or a tree-root and make music while tinuviel danced thereto , and when she danced to the playing of dairon more lissom was she than gwendeling , more magical than tinfang warble neath the moon , nor may any see such lilting save be it only in the rose gardens of valinor where nessa dances on the lawns of never-fading green .