The ii - V - I is the most common jazz cadence. The Roman numerals refer to chords. Say you're in the key of C. The ii, is a minor chord (due to the lowercase numeral) based on the second degree (due to the numeral being 2) of the key you're in. So the ii chord is Dm. Now the V chord is a major chord based on the 5th degree, G. The I is the major chord based on the first degree, C. These are usually extended to 7th chords at least to get Dm7, G7, Cmaj7. In Bb, it would be Cm7, F7, Bbmaj7. You should be able to figure the others out if you know your scales.
"You must stab him in the heart with the Bone Saber of Zumacalis... well, you could stab him in the head or the lungs, too... and the saber, it probably doesn't have to be bone, just anything sharp lying around the house... you could poke him with a pillow and kill him."
- Aqua Teen Hunger Force, The Universal Re-Monster
