The Book of Psalms is canonical in Judaism (Ketuvim) and Christianity (Old Testament), with its authority confirmed by ancient manuscripts (Qumran), the New Testament, and councils (Hippo, Carthage). The Ethiopian Orthodox Tewahedo Church, however, has a broader canon that includes Psalm 151 as an integral part of the Psalter, accepted as Holy Scripture also by Orthodox, Syriac, and Armenian traditions, demonstrating the historical diversity of biblical canons.
Psalms
Chapter 150
Praise ye the LORD. Praise God in his sanctuary: praise him in the firmament of his power.
Praise him for his mighty acts: praise him according to his excellent greatness.
Praise him with the sound of the trumpet: praise him with the psaltery and harp.
Praise him with the timbrel and dance: praise him with stringed instruments and organs.
Praise him upon the loud cymbals: praise him upon the high sounding cymbals.
Let every thing that hath breath praise the LORD. Praise ye the LORD.