1)
What is "Ran"?
1.
Ramban: It is singing and praising.
2.
Malbim: When a king places the cornerstone of his palace, he stations officers and singers to sing and shout. The verse depicts that when Hashem placed the cornerstone of the world, all Kochevei Voker sang, and all Bnei Elokim shouted.
2)
What are "Kochevei Voker"?
1.
Ibn Ezra: They are the seven Mesharesim. They are called Kochevei Ohr. 1
1
I.e. Kochevei Lechet - the sun, moon and five closest plants. (PF)
3)
When did the stars sing together?
1.
Rashi: At the beginning [of the creation].
4)
What are "Bnei Elokim"?
1.
Ibn Ezra: They are the higher Ma'arachos. Their movement is their song.
