[tinco]

You can sing "do, re, mi, fa, so, la, di", you've probably heard it before somewhere. If you do it right, every word you sing should result in the letter changing up the alphabet more or less. Doesn't matter if you're notes aren't very true, or that you don't start at the right frequency, I guarantee that you will get the relative distances close to right, and the tuner will have you believe it ;)