Piano Sonata No. 29 in B-Flat Major, Op. 106 "Hammerklavier": I. Allegro - Recorded 1977·Ludwig van Beethoven, Maurizio PolliniPiano Sonata No. 29 in B-Flat Major, Op. 106 "Hammerklavier": I. Allegro - Recorded 1977·Ludwig van Beethoven, Maurizio Pollini