Given the wide range of styles in <answer>classical music</answer>, from Medieval plainchant sung by monks to Classical and Romantic symphonies for orchestra from the 1700s and 1800s to avant-garde atonal compositions for solo piano from the 1900s, it is difficult to list characteristics that can be attributed to all works of that type. However, there are characteristics that <answer>classical music</answer> contains that few or no other genres of music contain, such as the use of a printed score and the performance of very complex instrumental works (e.g., the fugue). As well, although the symphony did not exist through the entire <answer>classical music</answer> period, from the mid-1700s to the 2000s the symphony ensemble—and the works written for it—have become a defining feature of <answer>classical music</answer>.
The use of a printed score and the performance of very complex instrumental works are characteristics of what?
classical music