to sing
to sing of (love, beauty, etc.) in a poem; to express in the form of a poem; to recite (a poem)
to start singing
to put into song; to express in verse
お風呂で歌うのが好き。
I like singing in the bath.
彼女が歌っているのを聞いた。
I heard her singing.
みんなで一緒に歌えたら楽しいだろうな。
It would be fun if we could all sing together.