Music at L'Enfant

The poet Billy Collins once laughingly observed that all babies are born with a knowledge of poetry, because the lub-dub of the mother's heart is in iambic meter. Then, Collins said, life slowly starts to choke the poetry out of us. It may be true with music, too.

from a great article-
http://www.washingtonpost.com/wp-dyn/content/article/2007/04/04/AR2007040401721.html
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Meter/Metre Is the regular pattern of stressed and unstressed syllables that make up a line of poetry. Meter gives rhythm and regularity to poetry.

Iambic meter

An end stressed two syllable foot e.g. from In Memoriam by Lord Tennyson

I DREAMED | there WOULD| be SPRING | no MORE
Iambic is an example of rising meter.