The Canticle of Miriam, also known as the Song of Moses (Az Yashir Moshe). Source of text is Exodus 15:1-3. In the Catholic novus ordo adopted in 1970 it has a prominent place in the Easter Vigil.
View the Wikipedia article on Cantemus Domino.
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Text and translations
15:1 Cantemus Domino gloriose enim magnificatus est: equum et ascensorem projecit[dejecit]
15:1 I will sing unto the Lord, for he hath triumphed gloriously: the horse and his rider hath he thrown into the sea.