In the late 18th century, when performers play a trill, it always starts from the upper note. However, "Christoph Koch expressed no preference and observed that it was scarcely a matter of much importance whether the trill began one way or the other, since there was no audible difference after the initial note had been sounded." Clive Brown writes that "Despite three different ways of showing the trills, it seems likely that a trill beginning with the upper note and ending with a turn was envisaged in each case."