https : / / www . youtube . com / watch ? v = Uc 15 Ea 1 iXdw 동영상 Beethoven : Sonata No . 2 in A major Op . 2 No . 2 , - I . Allegro vivaceMurray Perahia , piano Beethoven : Piano Sonata no . 2 in A major Op . 2 no . 2 I . Allegro vivace - http : / / www . youtube . com / watch ? v = U . .. www . youtube . com