As a child in the 1970's I would watch Saturday morning cartoons and at the end there would be these special features called "Schoolhouse Rock" Just a minute or two long teaching (what?!? education on a Saturday during cartoons -- how dare they) history, math, language, science, etc. in a fun, music-filled way. Ask anyone around my age to recite the Preamble to the Constituition and we will all start the way it started on Schoolhouse Rock. We know three is a magic number, Inter-planet Janet (she's a galaxy girl), and Lolly's is the placed to get your adverbs. So, I hope my fondness for the 1970's and Saturday morning cartoons will help you figure out this puzzle.
You can validate your puzzle solution with certitude.