 Even more tellingly, many manuscripts, especially from the middle of the century and later, feature written-out organ accompaniments.It is this last observation which leads directly to the foundations of continuo practice, in a somewhat similar one called "basso seguente" or "following bass".Written-out accompaniments are found most often in early polychoral works (those composed, obviously, before the onset of concerted style and its explicit instrumental lines), and generally consist of a complete reduction (to what would later be called the "grand staff") of one choir's parts.