Except Eph. 5:19 speaks more along the lines of "pluck your heartstrings." Not pluck your harp.Furthermore, in Eph 5:19, the phrase “making melody” is the Greek word, psallo which means, “1) to pluck off, pull out, 2) to cause to vibrate by touching, to twang, 2a) to touch or strike the chord, to twang the strings of a musical instrument so that they gently vibrate, 2b) to play on a stringed instrument, to play, the harp, etc. 2c) to sing to the music of the harp 2d) in the NT to sing a hymn, to celebrate the praises of God in song.”1 We can see that the making melody to the Lord involves the use of musical instruments.
Thanks for expanding on your view.