Is good; bountiful and gracious, especially to you, and therefore he justly expects and deserves your praises. Is pleasant; the work itself of singing praises to God is pleasant, as it is more fully expressed, Psalms 147:1.
Related Commentaries of Psalms 135:3
Psalms 135:3
3 Praise the LORD; for the LORD is good: sing praises unto his name; for it is pleasant.