This video shows ‘A Northern Cardinal singing in the Montreal Botanical Garden [in Canada], May 2007.’
From the Smithsonian Migratory Bird Center in the USA:
Neighborhood Nestwatch Data Summary
Since the inception of Neighborhood Nestwatch in 2000, 248 nests from 8 different kinds of birds, commonly found in Washington D.C. backyards, have been monitored.
The 8 species are: Song Sparrow, Northern Mockingbird, Carolina Chickadee, Carolina Wren, American Robin, Northern Cardinal, Gray Catbird, and House Wren.
Birds around Albany, New York: here.
Coastal plain swamp sparrow in the USA: here.
Birds sing louder in cities: here.
House sparrows in the USA: here.