In early collections the terms "catch" and "round" were interchangeable and, with part-songs and multi-voice canons, were all indexed as "songs". The catch and round differ from the canon in having a cadence on which the song can terminate after a specified number of repeats or when the leader gives a signal. A catch does not necessarily require the lines of lyrics to interact so that a word or phrase is produced from one part in the rests of another. This view became prevalent in the later part of the eighteenth century under the influence of the competitions sponsored by the Noblemen and Gentlemen's Catch Club.