Sing aloud unto God our strength - The strength and support of the nation; he from whom the nation has derived all its power. The word rendered sing aloud means to rejoice; and then, to make or cause to rejoice. It would be appropriate to a high festal occasion, where music constituted an important part of the public service. And it would be a proper word to employ in reference to any of the great feasts of the Hebrews.
Make a joyful noise - A noise indicating joy, as distinguished from a noise of mourning or lamentation.
Unto the God of Jacob - Not here particularly the God of the patriarch himself, but of the people who bore his name - his descendants.