In December 1968, New York Philharmonic, Carlo Maria Giulini: Mozart: Divertimento No. 11 in D major, K.251; Piano Concerto No. 20 in D minor, K.466; Masonic Funeral Music, K.477 / 479a; Symphony No. 40 in G minor, K.550 Irving Kolodin wrote in  Saturday Review  (28 December 1968):  'A different direction began to assert itself early in the D-minor Concerto, performed with fastidious artistry and superior insight by the orchestra as well as the invincibly facile Michelangeli.

​In 1966, after more than fifteen years, Michelangeli embarks on his third North American tour. On 21 January, 1966, he returned to play in Carnegie Hall for the first time in 15 years. A few days earlier [6 January] his performance of Beethoven’s Emperor with William Steinberg and the New York Philharmonic drew rave reviews, and was captured on tape by a musical bootlegger. (John Bell Young) ​I've added this further report to the relevant web-page. In the  Saturday Review