According to Espie Estrella, the ELEMENTS OF MUSIC are explained as followed:

Sound is created when an object vibrates. These vibrations are perceived by our ears and then sent to our brain. Our brain in turn analyzes these signals and let's us know what type of sound we are hearing (i.e. an alarm clock ringing, a car horn blaring, etc.). Music is differentiated from other sounds because it has certain qualities.

When you listen to a piece of music, you'll notice that it has several different characteristics; it may be soft or loud, slow or fast, combine different instruments and have a regular rhythmic pattern. All of these are known as the "elements of music."

Beat and Meter - In order to define meter, let's first define beats. Beats give music its regular rhythmic pattern. Beats are grouped together in a measure; the notes and rests corresponds to a certain number of beats. Meter refers to rhythmic patterns produced by grouping together strong and weak beats. Meter may be in duple (2 beats in a measure), triple (3 beats in a measure), quadruple (4 beats in a measure) and so on.

Dynamics - Dynamics are abbreviations or symbols used to signify the degree of loudness or softness of a piece of music. It also indicates whether there is a change in volume.

Harmony - In general, harmony refers to the combination of notes (or chords) played together and the relationship between a series of chords. But to give you a better understanding of harmony, let's first define melody. Melody refers to the tune of a song or piece of music. It is created by playing a series of notes one after another. Harmony accompanies and supports the melody. It is created by playing a group of notes (either simultaneously or as broken chords) behind the melody thus giving it musical texture.