Book III contains Psalms 73 to 89. Book IV contains Psalms 90 to 106. Book V is made up of Psalms 107 to 150. Psalms is the longest book in all the Bible. It has 150 chapters.
Psalms also contains the longest chapter in the Bible.
This is Psalm 119, which has 176 verses. The shortest chapter in the Bible is Psalm 117, which has only two verses in it. Some people have argued that it is acceptable to use instrumental music in our Christian worship because it is mentioned so often in the book of Psalms. They forget that Psalms is a part of the Old Testament. We follow the New Testament pattern for worship.