A piece in 3Ĩ, simply by halving the length of the notes. In a sense, all simple triple time signatures, such as 3Ģ, etc.-and all compound duple times, such as 6ġ6 and so on, are equivalent. Mathematically, the time signatures of, e.g., 3Ĩ are interchangeable. Conversely, at slow tempos, the beat might even be a smaller note value than the one enumerated by the time signature. For example, a fast waltz, notated in 3Ĥ time, may be described as being one in a bar. On occasion, a bar may seem like one singular beat. Either way, the next lower note value shorter than the beat is called the subdivision. Most commonly, in simple time signatures, the beat is the same as the note value of the signature, but in compound signatures, the beat is usually a dotted note value corresponding to three of the signature's note values. Depending on the tempo of the music, this beat may correspond to the note value specified by the time signature, or to a grouping of such note values. Musical passages commonly feature a recurring pulse, or beat, usually in the range of 60-100 beats per minute. Less-common signatures correspond to complex, mixed, additive, and irrational meters. Most time signatures are either simple (the note values are grouped in pairs) or compound (grouped in threes). A mid-score time signature, usually immediately following a barline, indicates a change of meter. In a music score the time signature appears at the beginning as a time symbol or stacked numerals, such as or 4Ĥ (read common time or four-four time, respectively), immediately following the key signature (or immediately following the clef symbol if the key signature is empty). The time signature is a notational device representing the meter, which is an auditory feature of the music. The time signature (also known as meter signature, metre signature, and measure signature) is a convention in Western musical notation to specify how many of a particular note value are contained in each measure ( bar), and in many cases how these note values are grouped into musical stresses ( beats).
The time signature indicates that there are three quarter notes (crotchets) per measure (bar).
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