Is This the First Mention of the Words "Collaborative Pianist"?

Although the term "collaborative pianist" is generally known to have been coined by Samuel Sanders in the early 80's, less is known about when the term was first used in the press. Fortunately, Google News is a very useful tool for this kind of search. The first usage of the words "collaborative pianist" in print was from a review of cellist Barbara Mallow in the New York Times of Monday, March 13, 1978 by Joseph Horowitz. The first pianist referred to in this manner was not Samuel Sanders but Albert Lotto:

Albert Lotto was the strong, richly collaborative pianist in the Beethoven and Brahms works, and Carol Stcin Amado was the capable violinist.

Looking closely at the sentence, the usage in this sentence isn't in relation to Albert Lotto as a "collaborative pianist", but as a pianist with "strong, richly collaborative" abilities. Could Samuel Sanders have read this specific Joseph Horowitz review, prompting him to coin a new term for the entire accompanying field?

While you're contemplating, here's a video of Albert Lotto playing the Liszt Sonetto del Petrarca #104 in 2009. As always, your comments and reminiscences on this issue are welcome.