The Asaphites that handled the worship service, possibly Levites and belonging to the priesthood. Some others, are Psalmssome of those who wrote Psalms for worship other than David. Moses and othersalso wrote some Psalms, long before David. All the Psalms, written by David or others, were inspired by the Holy Spirit and therefore is the ultimate author of them all.
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness.
2 Timothy 3:16