mesure

Here are a few examples:

• 4/4 (Four Four): In 4/4 time, the 4 at the top shows that there are four beats in each measure, and the 4 in the bottom indicates that a quarter note counts as one beat.
• 3/4 (Three Four): In 3/4 time, the 3 at the top signifies that there are three beats in each measure.

The measure when talking about the bar lines i mentioned the word measure. When a bar line creates space for music notes we call that a measure the measure is just like a room in a musical.

metre, also spelled Meter, in music, rhythmic pattern constituted by the grouping of basic temporal units, called beats, into regular measures, or bars; in Western notation, each measure is set off from those adjoining it by bar lines.

Very simply, we use measures because they make it easier to read music. The role of measures in music notation is to group notes, providing structure and coherence to our musical ideas.

4/4 means there are 4 beats in each measure and a quarter note receives one count. 2/4 means there are 2 beats in each measure and a quarter note receives one count. 2/2 means there are 2 beats in each measure and a half note receives one count.

Groups of measures that contain one idea are called a phrase. Phrases are often, but not always, four measures long. Phrases can be grouped together and simply be called "phrase groups" or they can follow a stricter form called periods if they contain certain cadence patterns.

Measures divide the piece into groups of beats, and the time signatures specify those groupings. (twelve beats per bar, with each beat being an eighth note; in practice, the eighth notes are typically put into four groups of three eighth notes.

variants or chiefly British metre. ˈmēt-ər. : the base unit of length in the International System of Units that is equal to the distance traveled in a vacuum by light in 1/299,792,458 second or to about 39.37 inches.

“Metre” is the British spelling of the unit of length equal to 100 cm, and “meter” is the American spelling of the same unit. However, “meter” is also used in British English, but it means something different. A “meter” in British English is an instrument for measuring.

In music theory, a bar (or measure) is a single unit of time containing a specific number of beats played at a particular tempo.

A measure is equivalent to one group of beats (duple, triple, or quadruple). Measures are separated by bar lines . Time signatures in simple meters express two things: how many beats are contained in each measure (the top number), and the beat unit (the bottom number), which refers to the note value that is the beat.

Sometimes depending on the tempo of the song. It might be too fast or too long. So generally 16 bars means about 30 seconds and 32 bars generally means about a minute it depends on the song.