William Jackson, Thirty Letters on Various Subjects…
“ Real music was as yet in its childhood; but the reign of Charles the second carried every kind of vulgar debauchery to its height. The proper æra for the birth of such pieces as “when quartered, have ever three parts obscenity, and one part music.” The definition of a catch is a piece for three or more voices, one of which leads, and the others follow in the same notes. It must be so contrived, that rests (which are made for that purpose) in the music of one line be filled up with a word or two from another line; these form a cross-purpose or catch,68 from whence the name. ”
