 Moreover , in terms of structure , Alkan in his compositions sticks to traditional musical forms , although he often took them to extremes , as he did with piano technique . The study Op. 39 , no . 8 ( the first movement of the Concerto for solo piano ) takes almost half an hour in performance . Describing this " gigantic " piece , Ronald Smith comments that it convinces for the same reasons as does the music of the classical masters ; " the underlying unity of its principal themes , and a key structure that is basically simple and sound . " 
