Gould's Mozart Piano Concerto no. 24 in C minor, K. 491

[Vincent Vo <Govincevo@AOL.COM>]

I recently purchased the Glenn Gould Edition recording of the C-minor concerto of Mozart. I think it's a terrific recording, although purists might feel different due to the "heavy" left hand. My question is, who's cadenza did Gould play in the 1st movement of the C-minor concerto? The cadenza doesn't seem like anything remotely Mozart, i found it very virtuosic and it's over two and a half minutes long. Un-Mozart indeed.

regards,
Vincent