For those unwilling to follow the link, an iamb is the base unit of Classical Greek poetry. It consists of a short syllable (italic) followed by a long syllable (bold). Tetrameter means that there are four iambs per phrase.
In bright -est day, in black -est night,
No e -vil shall es -cape my sight!
Let those who wor -ship e -vil's might
Be -ware my pow'r -- Green Lan -tern's light!
Now I'm tempted to do "Green Lantern, as written in Heroic Verse."