זַמְּר֣וּ יְהוָ֔ה כִּ֥י גֵא֖וּת עָשָׂ֑ה מידעת [מוּדַ֥עַת] זֹ֖את בְּכָל־הָאָֽרֶץ׃
Sing unto the LORD; for He hath done gloriously; This is made known in all the earth.
Ibn Ezra on Isaiah
זמרו Sing. Comp. זמרת the best fruit (Gen. 43:11). Lit. Give the best and choicest thing.
Ibn Ezra on Isaiah
גאות Excellent thing. Feminine, as seen by the affix 4It agrees therefore with the feminine מודעת זאת this is known..ת