Today there are four chapters.
Psalm 7 is a shiggaion, a dithyrambic ode of David. I would love to hear what the music to this Psalm sounded like.
Psalm 8 on the other hand has been set many times to music. Even I have sung it many times, both as a choir number and the first verse as an introit. Looking for the music I found a far better rendition of the Psalm, this one by Marty Goetz.
Exodus 3 is where God reveals himself to Moses in the form of a burning bush and declares “I am that I am”. Jesus makes a similar declaration in John 8:58 “Before Abraham, I am”.
In Exodus 4 God gives Moses his call. At first Moses comes up with one objection after another, but God persuades him with signs that he must go back to Egypt, face Pharaoh and lead his people.