Charles H. Spurgeon on Psalms 144:9

I will sing a new song unto thee, O God. Weary of the false, I will adore the true. Fired with fresh enthusiasm, my gratitude shall make a new channel for itself. I will sing as others have done; but it shall be a new song, such as no others have sung. That song shall be all and altogether for my God: I will extol none but the Lord, from whom my deliverance has come. Upon a psaltery and an instrument of ten strings will I sing praises unto thee. His hand should aid his tongue, not as in the case of the wicked, cooperating in deceit; but his hand should unite with his mouth in truthful praise. David intended to tune his best instruments as well as to use his best vocal music: the best is all too poor for so great a God, and therefore we must not fall short of our utmost. He meant to use many instruments of music, that by all means he might express his great joy in God. The Old Testament dispensation abounded in types, and figures, and outward ritual, and therefore music dropped naturally into its place in the "worldly sanctuary"; but, after all, it can do no more than represent praise, and assist our expression of it; the real praise is in the heart, the true music is that of the soul. When music drowns the voice, and artistic skill takes a higher place than hearty singing, it is time that instruments were banished from public worship; but when they are subordinate to the song, as here, it is not for us to prohibit them, or condemn those who use them, though we ourselves greatly prefer to do without them, since it seems to us that the utmost simplicity of praise is far more congruous with the spirit of the gospel than pomp of organs. The private worshipper, singing his solo unto the Lord, has often found it helpful to accompany himself on some familiar instrument, and of this David in the present psalm is an instance, for he says, "I will sing praise unto thee", —that is, not so much in the company of others as by himself alone. He saith not "we", but "I."