Schubert’s Piano Sonata in A Minor played fortissimo by Elisabeth Leonskaja on the top floor of the Ragged School Museum last night must rank as one of the more memorable musical experiences. She is nearly 80, trained in Russia, plays Schubert in a way that does not feel Schubertian, but with such power and intensity of feeling. It didn’t seem to matter at all that there was another concert going on in the park next door because everyone was rapt. Not to mention Pavel Kolesnikov and Samson Tsoy playing together and a performance of the Piano Trio in B flat major with Elisabeth Leonskaja on the piano. Quite an evening.