The different clusters of verses are each attributed to a specific aspect of nature. The first chapter expressed the feelings of the heavens, earth, gehinom, etc. Chapter two quotes day and night, sun and moon, winds and rain, etc. The third chapter focuses on things that grow - trees and produce. Chapters four and five are filled with the praises of animals. Here are two examples:
The Seas say: "More than the voices of many waters, mightier than the breakers of the sea, God is mighty on high" (Psalms 93:4).
The Snake says: "God supports the fallen and straightens the bent over" (Psalms 145:14).
Perek Shirah was printed early in the printing revolution, around 1576, when it was included in the liturgy.* There are references to it as far back as the 10th century. Many rabbis attribute great merit to reciting Perek Shirah, and some believe that reciting it for 4 consecutive days can help change a negative decree into a positive one.
*It is not generally included in the liturgy anymore.
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