Over the last few days I have heard a bird call in the Annex area of Toronto that I have never heard before: high up in the trees, sounding like a very loud chime, or as if someone was blowing across the top of a large bottle, repeated at intervals of a few seconds, up to 6 or ten times, and with a slightly electronic edge to it. Usually early morning or late afternoon. I would appreciate suggestions of what it could be.