Rhythm, Tempo, Meter, Texture - Quick Reference

Rhythm and Tempo

Rhythm is the way music is organized in time; tempo is the speed of the beat; the beat is the basic regular pulse.
A beat is not a fixed unit of time; tempo changes how long a beat lasts. A faster tempo makes beats shorter; slower tempo makes beats longer.
A metronome demonstrates tempo by providing a regular click; tempo is often described with beats per minute (BPM).
Tempo terminology historically uses Italian terms (e.g., adagio, vivace, presto); many terms are intentionally vague to allow performer interpretation.
Modern practice often specifies tempo with exact BPM, though Italian terms may still be used in art music.
Expressive tempo changes: accelerando (speed up) and retardando (slow down); molto = very; odd tempo = return to a previous pace.
Tempo and meter interact: tempo sets beat length, meter defines recurring strong/weak beat patterns.

Meter is the organization of beats into recurring patterns of two (duple), three (triple), or four (quadruple) beats.
Strong vs. weak beats create a felt metric structure; accents highlight the downbeats.
Common meters: 2-beat (duple), 3-beat (triple), 4-beat (quadruple).
Historical shift: quadruple meter accents often on 1 and 3; modern practice (notably after the 1950s) often emphasizes 2 and 4 in many styles (e.g., rock, R&B).
Romantic era (late 18th–19th c.) popularized flexible tempo (rubato), with performers pushing/pulling time for expression.

Simple meter: beats subdivided by two; e.g., 4/4 where each beat can be divided into two (1-2, 3-4).
Compound meter: beats subdivided by three; e.g., 6/8 where each beat subdivides into three.
Notation distinguishes how the beat is subdivided, though both can have the same overall tempo.
Some music uses cross-rhythms or mixed meters; Daydreaming by Radiohead is a famous example of 3 against 2 (a cross-rhythm) rather than a pure simple/compound distinction.

Time signature: at the start of a piece, shows meter (top number) and beat value (bottom number).
- Top number: 2, 3, 4 indicating duple, triple, quadruple meters respectively.
- Bottom number: note value that counts as one beat (commonly 4 for quarter, less commonly 8 for an eighth-based beat).
Measures (bars) group beats; bar lines separate measures.
Note durations (most common):
- Whole note: duration = 4 beats
- Half note: duration = 2 beats
- Quarter note: duration = 1 beat
- Eighth note: duration = frac{1}{2} beat
- Sixteenth note: duration = frac{1}{4} beat
Notation visually encodes meter and rhythm; longer/shorter notes and register changes can emphasize strong beats.

Rhythm can be notated with bar lines (measures) and time signatures to guide performers.
Pitch (melody/harmony) is separate from rhythm; rhythm can exist independently (e.g., clapping or tapping).
You don’t need to read music to understand these concepts, but notation provides a visual way to see pulse and meter.

Texture = how melody and harmony weave together; not just how many instruments, but how parts relate.
Monophony: one line of melody, no harmony.
- Examples: Gregorian chant; solo or unison vocal lines (even with instruments accompanying, if only one melody line, it’s monophony).
Homophony: one main melody with accompaniment (usually chords).
- Examples: solo voice with guitar accompaniment; piano pieces with melody foreground and chordal background.
Polyphony: multiple independent melodies simultaneously; all lines have their own character.
- Examples: Bach’s dense counterpoint; Gesualdo’s vocal polyphony; parallel to Renaissance/Baroque practices.
Other textures:
- Homorhythmic: multiple parts move in the same rhythm.
- Heterophony: same melodic line with slight variations among parts.
- Biphony: two distinct lines, where one is static or simple while the other is more active.

Duple meter in Mozart and Led Zeppelin pieces: strong-weak beat patterns, easy to feel as 1-2, 1-2.
Triple meter and waltz association: strong beat on 1 with weaker 2-3; some pieces push/pull the timing (romantic-era expressive rubato).
Quadruple meter evolution: early accents on 1 and 3; later popular emphasis on 2 and 4 in many genres (rock, pop, R&B).
Reggae syncopation: offbeats and upbeats emphasized (the ands between main beats) creating a distinctive groove.
Syncopation: shifting accents off the expected beat; can be simple or highly complex (e.g., metal rhythms with dense poly-rhythmic layers).
Polyrhythms: two (or more) different meters simultaneously (e.g., 3 against 2; 7 against 11); common in some traditional folk musics; challenging to perform.
Three against two (3:2) polyrhythm is a common, approachable example (e.g., Daydreaming by Radiohead).

Beat: basic pulse; tempo sets its length via BPM.
Tempo: speed of the beat; can be vague in historical/art music or precise in modern scores (BPM).
Meter: patterns of strong/weak beats; duple (2), triple (3), quadruple (4).
Simple vs. compound: simple divides each beat by two; compound by three.
Time signature: top = meter type; bottom = beat value (often 4 for quarter note).
Syncopation: emphasizes offbeat positions contrary to expectations.
Polyrhythm: two or more independent rhythms/meters layered together.
Texture: monophony, homophony, polyphony (plus related textures).
Romantic era: expressive tempo with rubato; performance practice valued performer individuality.