'It is, aside from two passages, one of Beethoven’s easiest- but as far as the performance of individual passages and its whole spirit is concerned, requires every kind of care'', thus wrote a contemporary critic. And it is for this reason that Beethoven’s Sonata op. 90 is extremely popular today, both with piano students and also with professional pianists. It provides enough challenges: for example the notorious tenth figures in the left hand and ╩ in the words of a contemporary ╩ ''uniqueness