Kaleea,

You wrote that "A catch is said to be a round which, by careful arrangement of the voices, produces hidden meanings (double entendres) when the voices are heard in combination which are not apparent when the text is read in linear sequence. . . ."

I've been collecting versions of "Miss Susie Had A Stemboat" and other children's rhymes that are composed with a profanity avoidance formula. In that formula the last word in a sentence is missing but flows into the first word of the next sentence and that word has both a naughty and a 'clean' meaning.   Since these rhymes are recited in unison, I gather that they wouldn't be called "catches", right? Does anyone know what they are formally called besides rhymes?

Here is the example:

Miss Susie had a steamboat,
the steamboat had a bell.
the steamboat went to heaven,
Miss susie went to
hello operator,
give me number nine,
and if you disconnect me,
I'll chop off your
behind the refrigerator
there lay a piece of glass
Miss susie sat upong it
and broke her little
ask me no more questions
tell me no more lies
the boys are in the bathroom
zipping up their
flies are in the city
bees are in the park
Miss susie and her boyfriend
are kissing in the
d-a-r-k
d-a-r-k
d-a-r-k
dark dark dark
the dark is like the movies,
the movies like the show
the show is like the tv set
and that is all i know...

{In some versions, the rhyme continues without the profanity avoidance pattern}...