You know what “every good boy does fine” means, right? It’s a mnemonic, a trick for remembering what note sits on what line of the treble clef: E G B D F.

And Roy G. Biv? He’s the way you remember the colors of the rainbow, in order: Red, Orange, Yellow, Green, Blue, Indigo, Violet.

In high school biology, King Philip came over from great Spain to remind us that the order of taxonomy is Kingdom, Phylum, Class, Order, Family, Genus, Species.
I was a music major in college, and when you learn the history of Western music, you start with Gregorian chant. Chant is intimately tied to the Church, and to the prayer services of the day, known as the canonical hours: Matins, Lauds, Prime, Terce, Sext, None, Vespers, Compline.
In order to remember the canonical hours, one of my classmates – a cellist named Betsy – came up with a wonderful mnemonic.
My lady, please touch softly, not very clumsily.
As you can see, it’s a good mnemonic, because lo these many years later, I still know my canonical hours.
What’s your favorite mnemonic?