Assertion: concerto's key | /r/HasProperty | a♭ major
Facets:
Source sentences:
text: This is answered by a smoother and more consoling second theme, played by the strings and set in the subtonic key (A♭ major) over a pedal point, before a more turbulent reappearance of the woodwind theme, this time re-enforced by driving piano arpeggios, gradually builds to a stormy climax in C minor that ends in a perfect cadence on the piano.