Dr. King makes his points in order from which they first occured so that the audience of whoever it be that reads the two excerpts can see and understand when the order of events took place. If they were to occur in random order, the audience would be confused and not understand the idea of the passage. Keeping things in order is key to having a strong excerpt, essay, poem etc.
Basically summarizing what you've read in a easier format.
Answer:
Many musical words and notes are used in the psalms.
Many psalms were sung.
Explanation:
"Psalms" is one of the 66 books in the Bible of the Christian faith. They contain songs or praise and worship which are mostly written by David, the then king of Israel.
The name "Psalm' is derived from a Greek translation, "<em>psalmoi</em>" meaning "instrumental music, or words accompanying the music". The psalms of the Bible are also lyrical songs of praise that can be sung or recited as verses. The presence of musical words, notes and the very nature of the lyrics shows that there are some patterns, rhythm or even meter in the Psalms.