As I have been reading through the Psalms, I felt led to render a contribution for your consideration:
The book of Psalms was the hymn book and prayer book of the Jews in the Old Testament. Many of these poems were written by or associated with King David, but they span 1000 years, with some written at the time of Moses (e.g. Psalm 106) and others at the time of the Exile (e.g. 137). Organised in five books , they reflect centuries of personal response and collective worship to God, are timeless in their expression of the gamut of human emotions, and can easily be applied to the Christian life.
There are psalms of grief, despair, anger, guilt, jealousy and doubt as well as positive emotions of joy, hope, peace and adoration. Themes include the Law, Jerusalem, Israel’s history, the Messiah and God’s mercy and justice. (Some appear to fit together, but mostly there is no logical order, or apparent reason to the (sequence). No 139 described as ‘the crown of all’ (I have the words in the hymn ‘O God, you search me and you know me’ and will bring copies if we can render musically)?! Others used for call to worship: 121 (Sang as ancient worshippers journeyed to Jerusalem to worship at the temple) ‘I will lift up my eyes to the hills’. When in need of protection: 16 ‘Preserve me, O God: For in thee do I put my trust’ 91 ‘He who dwells in the shelter of the Most High’ 23 ‘The Lord is my shepherd, I shall not want’. 46 ‘God is my refuge and strength’. I trust this is of benefit.