Charles H. Spurgeon on Psalms 89:1

I will sing. It is to be observed that he does not say, I will speak of the goodness of the Lord; but, I will sing. The celebration of the divine goodness has joined with itself the joy and exultation of a pious mind, which cannot be poured forth better than in song. That pleasantness and exuberance of a happy spirit, which by singing is instilled into the ears of the listeners, has a certain wonderful power of moving the affections; so that not in vain were pious minds taught by the Holy Spirit to inculcate the wonderful work of God in songs composed for this purpose, to commit them to memory and to appoint them to be sung. —Musculus.