"Several people" have contacted Greater Manchester Police directly after the conclusion of the trial of Michael Brewer, the former director of music at the school.
A spokeswoman for Chetham's said:
The police are now investigating the allegations of abuse at the school in the 1980s which have been the subject of recent newspaper reports. We will be assisting the police in whatever way we can.
While this investigation is ongoing it would not be appropriate for the school to comment any further, save to say that we encourage anyone who has any relevant information to contact Greater Manchester Police on 101, or Crimestoppers, anonymously, on 0800 555111.