And then I got it. The epiphany was as glorious as a unicorn sailing over a rainbow.
The song was from the Mighty Morphin' Power Rangers, specifically that of the Green Ranger's dragon flute. He played the tune to call forth the mighty Green Dragonzord, which was the most powerful zord in history, and could kick the shit out of everything.
The Dragonzord's prowess, however, introduces some serious conundrums to the Power Rangers Megaverse, including, but not limited to: "how did the Power Rangers ever defeat the Green Ranger when he was evil?", "how was the Green Ranger NOT the leader of the Power Rangers?", and "how come the show even existed when it was obvious that the Dragonzord could easily devastate any enemy that came along?"
These are indeed difficult questions, but they are answerable: the Green Ranger was under mind control, so the Power Rangers never had to defeat HIM, just to overcome the mind control; the Green Ranger was as kind and generous as he was powerful, and so wanted the Red Ranger to feel better; and the show was all about defeating every enemy so it was fine to have an overpowered Zord.
Well, the answer to the third question leads to the most puzzling paradox of all--how, in the name of Zordon, did the fusion of the Megazord and Dragonzord end up WEAKER than the Dragonzord by itself?????
Seriously, though, they only combine when the Megazord is kidding its butt kicked, and then after they combine, they STILL get their butt kicked. I would expect a combined Mega Dragonzord to be something a LOT more badass. Something like this.
Zordon texted me the other day. It said, "u haz teh powerz. here's the dragon flute for your entertainment. protect us from mega shark!"