KJV:
Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord;
NASB:
speaking to one another in psalms and hymns and spiritual songs, singing and making melody with your heart to the Lord;
KJV:
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
NASB:
Let the word of Christ richly dwell within you, with all wisdom teaching and admonishing one another with psalms and hymns and spiritual songs, singing with thankfulness in your hearts to God.