The book of Psalms is the most popular portion of the Bible for many. Its 150 chapters were written by David (about half of them), Solomon, Asaph, and a few others. The Holy Spirit inspired them all, as well as “all” other scriptures (2 Tim 3:16-17).
The Psalms speak of many subjects, and is sometimes called the songbook of the Jews. Jesus referred to Psalms as part of the Jews’ law (John 10:34; 15:25), which law was canceled, blotted out, when Jesus instituted the New Covenant at His death on the cross (Col 2:14; Eph 2:14-16). Since Christians have been discharged from the old law, we no longer observe animal sacrifices, circumcision, holy wars, the Passover, etc. Paul said if a person keeps one part of the old law, he is debtor to keep it all … something no one can do.
Worship with various mechanical instruments of music was often spoken of in Psalms. The New Testament only authorizes singing, vocal music, in praising God today (Eph 5:19; Col 3:16).
David was ‘a man after God’s own heart,” who could play a harp. But he was also a man of war, an adulterer, a polygamist, etc.
Authority for worship today must derive from the New Testament, not from the old law.
Ask for Psalms subjects.