I wonder who first applied the term 'doo wop,' and when.
It is applied to 50's music but the term seems to have appeared in print for the music category much later.
In "Jargon," D. E. Miller, 1981, Doo-wop is defined as "Type of fifties rock or R and B in which the back-up vocals involved the repetition of such phrases as "doo-wop,", "Sh-bop," "Sh-boom," "doo-lang" and the like."
Lighter, J. E., "Historical Dictionary of American Slang," vol. 1, says "a style of rhythm and blues in which a lead vocalist sings over a rhythmically chanted background of nonsense syllables; a style popular esp. in the 1950's. Now S. E."

These definitions are the equivalent of saying a book is composed of nouns, verbs, adverbs, dialectical slang, etc. There should be a definition out there that captures something of the spirit of the music.