**The measure, or beat**, is the set of **values **on the staff definied to the **earpieces**, or rather vertical lines that divides in various spaces the staff. The last measure of a composition is always closed from a double earpiece.

Inside a measure there are musical values, notes, whose **addicion** should give a **constant value**. This value is estabilished at the beginning of the song, though a **fraction **in which on the **denominator** we’ll have a time unit (4 is a seminim), while at the **numerator** the amount of time units presents. In a beat of 2/4 we’ll have at maximum two semiminimum notes (**=1/4**). The following example will clarify the ideas.

Beats are divided in **simple measures**, those in which every time is represented to a easy value, or rather when at the numerator we see the numers 2, 3 e 4. They’re classified in **binary, ternary e quaternary’s measures.**

We know **compound measure** those in which times can be divided in three. If you want to obtain the corresponding measure, composed by a simple that should be multiplied for three the numerator and for two the denominator. Es: 2/4 = 6/8 ; 3/4 = 9/8 ; 4/4 = 12/8.

We’ll not stay here saying too much about this topic because we’ll see, meticolously how we should behave, by the metric/stylistic point of view. This is not a deeply topic, that i understand can be difficult, but essential to start.

Let me conclude mentioning the **metronome**. This is the instrument though is possible **measure the time and the rhythmic scan**. Like a pendulum, it moves his “pointer” to the right and left, everytime with a touch. **Every touch corresponds** (ex. in a measure of 2/4) **a semiminim note** (a quarter) that should durate until other touch’s arrival. Two completes touches, in this mode, will complete a beat.

We’ll see this concepts on firsts practise’s exercises.