AP Music Theory Unit 1 Foundations: Rhythm, Meter, and Expressive Elements

Rhythm

The organized pattern of durations (note lengths) and silences (rests) in music—determines when sounds happen and for how long.

Meter

The recurring pattern of strong and weak beats that organizes the pulse; something you feel, not just a written symbol.

Time Signature

The notated symbol (top and bottom numbers) indicating how music is grouped into measures: top = number of written units per bar; bottom = which note value is the written unit.

Note Values

Standard proportional symbols for duration (and corresponding rests), defined relative to the whole note; each smaller value typically halves the previous one.

Rest

A measured span of silence with a specific duration that occupies time just as precisely as a note.

Quarter Note (Context-Dependent Beat)

A note value equal to one quarter of a whole note; it is not automatically “one beat”—whether it gets the beat depends on the time signature and meter.

Dotted Note/Rest

A note or rest with a dot that adds half of the original value to its duration (making it 1.5× the base value).

Tie

A curved line connecting two notes of the same pitch so they sound as one continuous note, combining their durations without rearticulation.

Slur

A curved line connecting multiple different pitches to be played/sung smoothly in one gesture (an articulation/phrasing mark, not a duration-combiner).

Beaming

Grouping flagged notes (eighth notes and smaller) into beat-based units to show the beat structure and improve readability.

Subdivision

Dividing the beat into equal smaller parts (mentally or verbally) to maintain rhythmic accuracy and avoid rushing or dragging.

Simple Meter

A meter in which the main beat subdivides into two equal parts (e.g., 2/4, 3/4, 4/4).

Compound Meter

A meter in which the main beat subdivides into three equal parts; often written with 6, 9, or 12 on top (e.g., 6/8 felt as two dotted-quarter beats).

Duple/Triple/Quadruple (Beat Groupings)

Terms describing how many beats are grouped per measure: duple = 2, triple = 3, quadruple = 4 (can combine with simple/compound, e.g., “compound duple”).

Common Time vs. Cut Time

Common time: symbol “C,” equivalent to 4/4 (often felt in four). Cut time: “C” with a vertical line, equivalent to 2/2 (often felt in two half-note beats).

Irregular (Asymmetrical) Meter

Meters like 5/8 or 7/8 that are typically grouped as mixtures of 2s and 3s (e.g., 2+3, 3+2+2) rather than being random.

Syncopation

Rhythmic emphasis that contradicts expected strong–weak accents, often by stressing offbeats or sustaining across a strong beat so the strong beat lacks a new attack.

Anacrusis (Pickup)

One or more notes before the first full measure; the opening “pickup” measure is incomplete and the final measure often balances it.

Tempo

The speed of the beat, indicated precisely by metronome marking (BPM) or generally by tempo words (e.g., Largo, Adagio, Andante, Moderato, Allegro, Presto).

Metronome Marking

A numerical tempo indication specifying beats per minute for a particular note value (a precise tempo instruction).

Tempo Change Markings

Symbols/terms showing tempo changes over time: ritardando (gradually slower), accelerando (gradually faster), a tempo (return to previous tempo).

Rubato

Expressive flexibility of tempo (give-and-take timing) where time may stretch and compress, typically in a controlled way within phrases.

Dynamics

Markings for loudness (pp, p, mp, mf, f, ff) and changes in loudness (cresc. = gradually louder; dim./decresc. = gradually softer), interpreted relative to context.

Articulation

Markings that shape how notes begin/connect/end (e.g., legato, staccato, accent, tenuto), strongly affecting character without changing written rhythm.

Fermata

A symbol indicating a note or rest should be held longer than its written value; the exact length is stylistic rather than a fixed multiple.