The two men formed a close relationship and carried out experimental musical work with many of the most disabled and unreachable children who bore tragic lives of distress and self-injury. With the help of carefully chosen harmonies, appealing melodies and rhythms, the children were drawn into musical participation developing increased social and self-awareness, discipline and concentration. Placed in front of a snare drum and cymbal, they revealed their sensitivities and their expressive, receptive and relational abilities in their musical responses. It was a profound discovery of how music could be used for human benefit and Paul and Clive documented their observations and techniques in painstaking detail, making and transcribing recordings of their sessions. When Paul left Sunfield in June 1960 Clive accompanied him, gripped by the urge to continue what they had started. They visited 26 curative homes across Europe, giving illustrated presentations and live demonstrations of their work, then spent the next six years in Philadelphia exploring and establishing the work which they called therapy in music. A research grant from the National Institute of Mental Health supported them in this. There followed seven years in Europe where Paul and Clive worked as Lecturing Fellows of the American-Scandinavian Foundation from 1967 to 1974. This period saw the fruition of their work together with teaching engagements across Europe, the evolution of music therapy training for musicians, publications and television documentaries about their work. In the 1960s and 1970s, Paul and Clive toured the world demonstrating their work, with groups of followers starting to work wherever they went. After Paul Nordoff's died in 1977, Robbins continued his music therapy work, teaching and lecturing well into his 80s and renowned for his ability to inspire and captivate audiences with real-life stories of his charismatic life-transforming work in music. In 1975, Clive returned to the US where he married his second wife Carol Matteson, also a music therapist. Together they worked at the New York State School for the Deaf in Rome, NY (1975–81), at Southern Methodist University, Dallas (1981–82), continuing courses and lectures and maintaining ties in Europe with annual teaching engagements. From 1982 until 1989 they lived in Australia where they established a Music Therapy Centre at Warrah, an anthroposophical disability service centre and biodynamic farm, and a Nordoff-Robbins Association in Australia. In 1989 a dream was fulfilled with the establishment of the Nordoff-Robbins Center for Music Therapy at New York University, of which Clive and Carol became Co-Directors. The new Centre served as a music therapy clinic and training venue for music therapists in the Nordoff-Robbins approach.