The cyan triangle represents Odera despite his nonexistent role here, but foreshadowing the future. The Purple triangle represents Del Astra, The Pink triangle represents Del Aura, and the bigger white triangle represents Mu Phantazein. Despite not being his real triangle, Arama the First steals the smaller white triangle from Mu Phantazein while he's not looking, so it now represents him. The red-pink star in the distance represents Cor Caroli and Part 2 of the soundtrack. I am currently too lazy to add the descriptions for the other songs, so you can find them on youtube.