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Psalm 9 is a lament Psalm.
lament
Psalm 34 is classified as a psalm of thanksgiving and praise. It is also known as an acrostic psalm, where each verse begins with a successive letter of the Hebrew alphabet.
Asking for deliverance
Psalm 14 focuses on the way of the wicked. Psalm 15 focuses on the way of the righteous. It is a Psalm showing how a righteous person should live.
A melody. A song. Of the sons of Kor′ah.
A hymn or song of praise. It is also a doxology (conclusion) to the entire book of psalms.
It is about praise and music.
The seven penitential psalms are Psalms 6, 32, 38, 51, 102, 130, and 143. These psalms are traditionally associated with repentance and seeking forgiveness from God.
Psalm 100 is known as a Psalm of joy and reverence. It is often called the "Psalm of Thanksgiving" because it focuses on praising God with joy and thankfulness for His steadfast love and faithfulness.
To imprecate means to invoke (a curse) against someone. A few of the Psalms do this, such as Psalm 109. The imprecatory Psalms are Psalms of prayer and entreaty, in which King David asks for God to intervene against his enemies.See also:More about the Psalms
The book of Psalms have only 150 chapters, and not 201.