Ingredient of galactic scale In a universe where it is custom to harness the power of the stars to bake cakes and other delicious pastries on the Interdimensional Great British Bake-Off

I have a mouth but I don't eat. I have a bed but I don't sleep

from the town in which I was born, I heard a man who sailed the seas. in this story, so he told, they all lived, under the sea. in this world of melodic tone, enjoy seas of green, and sky of blue.

Me first, then you. Just try to do what I do. Watch for trucks, keep your bearings, grind to fake, security staring. If you miss when I hit, its a letter for you. I flipped hard down the stairs, better hope you can too!

I appear only when absent, Speak only when unheard, End the moment I’m solved, And leave no trace I was here. What am I?