The alphabet was mentioned in this thread a couple years ago, and setting things to music definitely helps memorization. When I recite the alphabet, I almost always hear the song that ends "Now I know my ABCs. Next time won't you sing with me?" in my head.
I can recite the preamble of the Constitution from memory, but the cadence tends to match the song from Schoolhouse Rock.
Thanks to an episode of Cheers, I'll never forget that Albania borders on the Adriatic, its land is mostly mountainous, and its major export is chrome. Coach was helping Sam get his GED and introduced him to the idea of remembering facts by associating them with music.