Piano duo Tami Kanazawa and Yuval Admoni Mormon University, Jerusalem August 9 Leaving their former, mainly virtuoso repertoire behind, piano duo Tami Kanazawa and Yuval Admoni displayed an increased level of maturity by presenting musically more significant works in their recent recital. At the center of interest was Beethoven's own, little-known four-hand version of his extremely demanding Grosse Fuge, written originally for string quartet. The duo's rendition highlighted the intricate polyphonic texture and the four string instruments' diverse tone colors as clearly and transparently as possible, without losing sight of the work's profound musical and emotional content. Concentrating on the work's spiritual aspects, and renouncing merely technical effects, the performance was a veritable artistic achievement. Grieg's Old Norwegian Romance, as curtain raiser, was another discovery of a rarely performed gem. Based on a traditional tune, Grieg has the piece undergo many diverse metamorphoses of character, rhythm and form. The duo captured the continually changing moods admirably. To revert to some virtuoso fireworks, the program concluded with a sparkling rendition of Ravel's Rhapsodie Espagnole.