It was the early 1990s and l lived on Jeanne-Mance, a bit south of Van Horne. One summer evening I heard a pretty, eerie sound coming from the alley through my open patio doors. It was two cats singing a duet. I had never heard cats make sounds like that. It was really pretty. Later that evening Neil Young's Harvest Moon came on the radio. Parts of that song sound very much like the duet I had just heard. One part is when the two ladies sing ooooooo. Another part is in the refrain when Neil Young sings, "on this harvest moon", including the accompanying ooooooo. Neil Young - Harvest Moon:

( The Story of Shirley the House Hamster )

This isn't Shirley, but looks an awful lot like her. . The picture is on this Hamster photo page