Rhythm

Rhythm is the organization of sound and silence over time through patterns of duration, accent, and grouping. It can be regular or irregular and need not follow a fixed beat.

Beat (music): A recurring pulse that provides a reference for musical timing. A beat can anchor rhythm, though rhythms may also cross or obscure it.
Subdivision (music): The division of a beat into smaller, usually even, time units. Subdivisions let rhythms place events between the main beats.
Clave (rhythm): A recurring rhythmic pattern that organizes many styles of Afro-Cuban music. Clave demonstrates how one repeated pattern can coordinate an ensemble's rhythmic parts.
Melody: A sequence of musical pitches perceived as a coherent tune. Melody organizes pitch over time, while rhythm concerns temporal patterning across musical events.
Drum kit: A collection of drums and cymbals played by one performer, especially in popular music. Drum-kit parts often articulate pulse, subdivision, and accents at once.
Tempo: The speed of a musical pulse, commonly measured in beats per minute. Tempo sets the pace against which rhythmic durations are heard.
Polyrhythm: The simultaneous use of contrasting rhythmic patterns or subdivisions. Overlapping patterns reveal how rhythm can hold more than one pulse structure.
Tala (music): A repeating cycle of beats used to organize rhythm in Indian classical music. Tala shows cyclic rhythmic organization with structures larger than a short measure.
Harmony: The study and use of simultaneous pitches and their relationships. Harmony chiefly organizes pitch relationships rather than durations and accents.
Conducting: The practice of directing a musical ensemble through gestures that coordinate timing and expression. Conductors make shared pulse and rhythmic cues visible to performers.

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