Mercurial Weathervane!
A bouncy, Dr. Seuss-cadence GRE vocabulary song teaching "mercurial" (changing mood or behavior quickly and unpredictably) through a weathervane that spins a different direction every single moment.
Up on the barn roof, spinning around, Lives a weathervane rooster who stays off the ground, He points to the East, then he points to the West, Then he spins to the North, always restless and quick.
He's Mercurial! Mercurial! Moody and quick, One second he's happy, the next he feels sick, One second he's laughing, the next he might frown, Mercurial rooster, spinning around and around!
He wanted a waffle, now he wants only rice, He wanted it toasty, now he wants it on ice, He said "let's go swimming," now he wants to stay in, Mercurial rooster, where do we begin?
He's Mercurial! Mercurial! Moody and quick, One second he's happy, the next he feels sick, One second he's laughing, the next he might frown, Mercurial rooster, spinning around and around!
The wind doesn't cause it, it's simply his way, His mood is a weathervane, changing all day, He's grumpy at breakfast, he's giddy by noon, Mercurial rooster, he'll change again soon!
He's Mercurial! Mercurial! Moody and quick, One second he's happy, the next he feels sick, One second he's laughing, the next he might frown, Mercurial rooster, spinning around and around!
So if you know somebody, whose mood likes to spin, Who's up in a minute, then down in a grin, There's a word for that rooster, a word bright and true, Mercurial! Mercurial! Now it's a word that you knew!
Spinning and spinning, mercurial and free, Never quite landing on who he will be, Mercurial! Mercurial! Up on the roof, Weathervane rooster, unpredictable proof!