structural:scholar_edition, quality:correction, stylistic:style_transfer, linguistic:translation, linguistic:paraphrasing
A time signature is an indication in music notation that specifies how many note values of a particular type are contained in each measure (bar). The time signature indicates the meter of a musical movement at the bar level. In a music score the time signature appears as two stacked numerals, such as ⁴4, or a time symbol, such as. It immediately follows the key signature. A mid-score time signature, usually immediately following a barline, indicates a change of meter. Most time signatures are either simple, or compound. Less common signatures indicate complex, mixed, additive, and irrational meters.