I suppose the "lily-white boys" are not human at all, but instead are arum lilies.

The "Seven stars" are presumably either the Pleiades or the Big Dipper.

The "April rainers" I think are the Hyades.

The "Symbols/Cymbals at your door" can either be a pentagram or a doorbell.

A Jewish counting-song, popular at the Feast of Unleavend Bread at least in the Russian/German/Lithuanian Jewish tradition, has

One is our God
Two are the tables of the Law
Three are the Fathers [Abraham, Isaac, Jacob]
Four are the Mothers [Sarah, Rebekah, Leah, Rachel]
Five are the orders of the Mishnah
Six are the ?
Seven are the days of the week
Eight are the ?
Nine are the [lunar] months of childbirth
Ten are the Ten Commandments
Eleven are the ?
Twelve are the sons of Israel.

I'm sure someone on-list can supply the ones I've forgotten.

T.