Psalm 45 is a Messianic psalm and it has in it's title the words, "... a love song."

Psalm 44 is about clinging to God even when He seems distant.

Psalm 43 reads like a continuation of Psalm 42. 

Psalm 42 was written by the Sons of Korah—an early temple worship leading group. 

King David concludes Psalm 41 by praising God for upholding him through his trials. It also includes a call to care for the poor.

 One important quality of Psalm 40 is that it emphasizes telling people what God has done for us. 

King David begins Psalm 40 by recalling God’s deliverance and faithfulness. It is a Messianic Psalm that is quoted in the New Testament. 

Psalm 39 discusses the idea of mankind being a mere breath.

In Psalm 38 we find King David confessing his sin and lamenting the suffering he has endured as a result of his sin.

In Psalm 37 we see a recurring idea of the meek inheriting the land.