Catches were originally written out at length as one continuous melody, and not in score. The change to printing in score was first made in the early eighteenth century, and this is now the normal method of presentation. In the score for a catch the different voices are usually labelled "1", "2", "3", etc. This indicates that voice "1" sings its part first and continues to part 2. When part 1 has been completed it is sung by voice "2" and so on. A common mistake in performance is for all parts to start together as though the score were to indicate a part song.