A.T. Robertson Commentary Ephesians 5:19

"speaking one to another in psalms and hymns and spiritual songs, singing and making melody with your heart to the Lord;" — Ephesians 5:19 (ASV)

To the Lord (τω Κυριω). The Lord Jesus. In Col 3:16 we have τω θεω (to God) with all these varieties of praise, another proof of the deity of Christ. See Col 3:16 for discussion.