Here’s a summary of what’s been cancelled as I understand it at time of writing:

• The Canadian Opera Company (including the free concert series), Tafelmusik, Opera Atelier, Soundstreams and the Toronto Symphony have all cancelled the remainder of their 2019/20 seasons.
• The Women’s Musical Club of Toronto has cancelled through May 7th.
• Voicebox’ Adriana Lecouvreur and Against the Grain’s Bound have been postponed until further notice.
• Opera Pub April and May editions are off.
• Most RCM/Koerner Hall events have been cancelled but last I heard they were still discussing some future events.
• UoT Music cancelled through April 3rd but I imagine that will be extended.

At this point I haven’t heard anything definite about TOT’s Northern Lights or Tapestry’s Rocking Horse Winner.