Rhythm reference
Time Signatures
A time signature is a notation convention that describes how beats or subdivisions are grouped within a measure and which note value represents the counting unit.
Developing reference
Overview
The upper number indicates how many notated units fill a measure, while the lower number identifies the note value used as that unit. The symbols resemble fractions but describe notation and grouping rather than arithmetic proportions.
Simple, Compound, and Irregular Meter
In simple meter, beats commonly divide into two equal parts. In compound meter, dotted beats commonly divide into three; irregular and additive meters organise unequal groups such as combinations of twos and threes.
Accent and Feel
A time signature suggests a metric framework but does not determine tempo, groove, syncopation, or expressive timing. The same signature can support many accent patterns and musical feels.
Applications
Understanding signatures helps with counting, reading, transcription, ensemble rehearsal, and choosing clear notation. Subdividing the underlying beat is often more reliable than counting only the visible note values.