[5] Though he chose to end his career as a concert pianist in 1963, he concentrated on teaching piano and adjudicating young musicians for another ten years.

[6] Living in Toronto, he began speaking spontaneously to those who requested that he do so,[7] ultimately offering many thousands of hours of metaphysical/philosophical lectures and meetings over his lifetime.

Ultimately, a number of them were gathered together and published as books or as spoken word recordings, described by one reviewer as offering metaphysical ideas which are "provocative and deeply inspiring.

[13] It has also been pointed out that Mills’ lectures and books "give a universal, metaphysical perspective on some of the most perplexing problems faced by men and women today.

[14] When three singers (from the vocal group The Free Design) asked him for help with their voices in 1976, Mills soon found himself re-engaging the world of concertizing.

[16] New York City critics described them as "an instrument of bright and extraordinary varied capacity"[17] and "a vocal ensemble of rare distinction.

While on tour in 1984, they were asked to make a recording for broadcast on Radio Vatican, inaugurating the World Year of Music in 1985.

[5] On their tour to the then-USSR in 1991, Mills and the Singers led the first non-military Victory Day Parade down Gorky Street in Moscow.

[6] In 1996, Mills began composing spontaneous orchestral works, using four MIDI keyboards plus foot pedals to capture his instantaneous compositions.

[20] His goal was to approximate the sounds of real instruments as closely as possible with the keyboards, and in 2002 a CD of several of his orchestral compositions, titled Majestic Tonescape, was released, performed by musicians from the Toronto Symphony Orchestra.

This showing was captured on a pioneering high-definition television recording at New York City’s Ed Sullivan Theater in February 1993.

That same year, the Senate of Canada recognized Mills with their Award of Excellence "for outstanding achievement in humanity, education, philosophy and arts.