EXPOSITION
This is sometimes called a "Hallelujah psalm," since it ends with that phrase. It is a song of praise to God for his dealings with his people, resembling in its general character Psalms 78:1-72. The opening passage is nearly identical with 1 Chronicles 16:8-22, and is thought to have been the original from which that passage was taken (Hengstenberg, Cheyne). The first six verse are an exhortation to praise, and constitute the "introduction." The remainder is an account of God's mercies to Israel as a nation, traced historically from the time of the covenant with Abraham to the occupation of the land of Canaan.
The "introduction" forms a strophe by itself. It is usual to divide the historical portion into strophes; but this can only be done arbitrarily, there being no really marked divisions.