challenge: What change did Tchaikovsky make to the piano chords in the opening section of Piano Concerto No. 1 between the original and final versions?
  
  A. He changed them from legato to staccato playing
  B. He changed them from block chords to arpeggios
  C. He changed them from arpeggios to block chords
  D. He changed them from minor to major chords
  Answer: 