[{"text_idx": "#000007", "text": "Music theory, within this realm, is studied with the pre-supposition that music is orderly and often pleasant to hear. However, in the 20th century, composers challenged the notion that music had to be pleasant by creating music that explored harsher, darker timbres. The existence of some modern-day genres such as grindcore and noise music, which enjoy an extensive underground following, indicate that even the crudest noises can be considered music if the listener is so inclined."}, {"text_idx": "#000008", "text": "20th century composer John Cage disagreed with the notion that music must consist of pleasant, discernible melodies, and he challenged the notion that it can communicate anything. Instead, he argued that any sounds we can hear can be music, saying, for example, \u201cThere is no noise, only sound,\u201d[3]. According to musicologist Jean-Jacques Nattiez (1990 p.47-8,55): \u201cThe border between music and noise is always culturally defined\u2013which implies that, even within a single society, this border does not always pass through the same place; in short, there is rarely a consensus.... By all accounts there is no single and intercultural universal concept defining what music might be.\u201d"}, {"text_idx": "#000029", "text": "Discover the powerful message behind Relentless Hope\u2019s motivational rap song"}]