1 a musical piece that is sung -- canción [ feminine, singular ]
to sing a love/folk/pop song cantar una canción de amor / folk / pop
2 singing as an activity -- canto [ masculine, singular ]
classes in song and dance clases de canto y danza
The occupation was bad in every way; only that song was nice.
Within hours, this song became an anthem in my country.
Do you think that is the way forward, or should we close our ears to the liberal siren song?