In the fall of 1959 Norma Beecroft, a twenty-five-year-old composition student, left her home in Toronto and travelled to Rome to study with the eminent Italian composer. She left behind her lover and mentor, the thirty-four-year-old Harry Somers, by then recognized as one of Canada’s leading younger composers. For the next six months they wrote each other almost every day. Their intense and intimate correspondence documents lives lived apart but shared on the page, until the relationship came to an abrupt end. Selected from the full extant correspondence, the letters show both composers at pivotal moments in their careers, processing music and culture in their respective environments in ways that would remain influential for themselves and to each other. Beyond illuminating a tempestuous love affair, their wide-ranging letters capture the development of Canadian arts and culture of the period. They record observations about significant figures in their circles; the performances, theatre, and art Somers experienced in Toronto; and Beecroft’s attempts to forge a viable compositional approach through contact with important artists and composers abroad. Somers eventually realized that what he wanted most was for Beecroft to give up her studies and return to Toronto to marry him. She turned him down and remained in Italy to study and write music, cementing her commitment to the vocation of composer that would shape the rest of her creative life. She would break ground as a woman in her field, a producer for the CBC, and a composer and early champion of electroacoustic music. A window into cultural life in Canada and Rome at the end of the 1950s, Between Composers is a striking record of a turning point in the lives and careers of two young artists that would mark them and their music for decades.