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Music is sound arranged so that pitch, rhythm, and timbre carry meaning. Almost every human culture has produced some form of it, and the practice reaches back at least forty thousand years, to bone flutes found in caves across central Europe. What counts as music shifts from one tradition to the next, but the raw materials stay remarkably constant: a sense of pulse, intervals between tones, and the silences that frame them.

The building blocks are few. Melody is a line of single notes heard in sequence. Harmony stacks notes together so they sound at once. Rhythm governs how long each note lasts and where the emphasis falls. A composer works these three against one another, and the balance between them tends to define a style — plainchant leans almost entirely on melody, while a dense orchestral chord depends on harmony for its weight.

How it travels

For most of its history music existed only in the moment of performance, carried from one player to the next by ear. Western notation, developed by monastic scribes around the ninth century, changed that by fixing pitch and duration in a written score, which made longer and more intricate works possible because a composer no longer had to rely on memory alone. Other traditions kept the oral line and built staggering complexity within it — the ragas of North India and the rhythmic cycles of West African drumming are learned and handed down without a written part.

Recording marked a second turning point. Once a performance could be captured and replayed, the bond between musician and listener loosened from any single time or place. A phrase played once in a studio can be heard a century later, in a setting its makers never imagined.

What music does for people is harder to pin down than how it works. It marks ceremony, holds memory, sets armies marching and children to sleep. Researchers keep finding that listeners across unrelated cultures agree, more often than chance would predict, on which pieces sound joyful and which sound grieved — a hint that some of its grammar runs deeper than any one tradition.