There can he no doubt but that when musical instruments are spoken of in the word of God, and in the Psalms more particularly, as we find them there more frequently mentioned, somewhat more is intended than the mere harps and cornets invented by men: I take it to mean, let all the chords of the heart be in unison of praise to the God of such rich mercies.
Related Commentaries of Psalms 98:4
Psalms 98:4-6
4 Make a joyful noise unto the LORD, all the earth: make a loud noise, and rejoice, and sing praise.
5 Sing unto the LORD with the harp; with the harp, and the voice of a psalm.
6 With trumpets and sound of cornet make a joyful noise before the LORD, the King.