Female Canaries can sing, it's not super common, but it does happen. They have a weaker song though.
Here is a video of a [supossed] female singing: http://youtube.com/watch?v=xPBly7vJUTs&feature=related
Did you know that both male and female Canaries can sing as youngsters... but it is a weak baby song and the females usually stop before 6 monthes of age.
Anyways for you orange Canary.. sitting in the food dish... he may be sick or she may be broody.
I had a female Canary that sang years ago. We always thought it was a male until it layed eggs. Can't remember enough to say if the song was similar to the link