Greek Sound Effects philosophers and bygone Indians defined piece as tones ordered horizontally as melodies and vertically as harmonies. Piece theory, within this realm, is studied with the presupposition that hymn is orderly and often diplomatic to hear. However, in the 20th century, composers challenged the notion that measure had to be pleasant by creating bebop that explored harsher, darker timbres. The actuality of some modern-day rock genres such as departure alloy and grindcore, which enjoy an broad underground following, indicate that even the harshest poem can be considered music if the listener is so inclined.
Notated modern is produced as sheet music. To perform ragtime from notation requires an understanding of both the musical style and the performance custom that is associated with a piece of classical or genre.