Greater Manchester Police (GMP) have praised abuse victim Frances Andrade for her "bravery" in facing her abusers in court.
The 48-year-old went on to take her own life after giving evidence at the trial of Michael Brewer and his ex-wife Kay.
Detective Chief Superintendent Mary Doyle, head of GMP's Public Protection Division, said:
The judicial process was somewhat thrust upon her when the matter was reported to police by a friend and I must credit Frances' bravery in facing her abusers head on in court and supporting the prosecution.
It is heartbreaking that she is not able to see she has been vindicated for the bravery she consistently showed, which has today ended with the Brewers being sentenced and brought to justice.
The force is conducting an historic sex abuse investigation in relation to offences at Chetham's School of Music as a result of calls from former pupils, she added.
The son of a woman who was abused by a choirmaster as a teenager and took her own life has spoken of the legacy of his "wonderful mother".
Claims of sex abuse by music teachers are spreading beyond the Chetham's music school in Manchester where they began.