What is music? If you ask one hundred people this question, you will probably get a hundred answers. To some people, music is a way to relax, something to play in the background while we do our chores, or just something we swivel our body to when we cannot help it. To some, music can lift them to a heavenly ecstasy or hurl them down to a an abysmal depression. By all means, no matter who we are, listeners or writers of music, we express feelings and find ourselves a place that solely belongs to us in music. The Merriam-Webster Dictionary (n.d.) defines music as “the science or art of ordering tones or sounds in succession, in combination, and in temporal relationships to produce a composition having unity and continuity.” (Def.1). In the Oxford Dictionaries (n.d.), music is “vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion” (Def.1). So how do we categorize music in order to study it more precisely? Parker (2009) has pointed out four essential components of music. First of all, music has tones, which are also called pitches. A pitch differentiates a middle C from low C and high C on a piano keyboard. Secondly, music must have rhythm. Rhythm is the length of each note. It is also called the beat that we often clap our hands or tap our feet to. Third, the sound of music reaches our ears in various intensities. Some notes are louder than others. Sometimes a pause, or a complete silence is also part of music. Finally, timbre gives music different “colors”. The saying is true: “No two voices are the same.” Timbre makes someone’s voice unique in the world, and makes a violin sound like a violin, and not a piano, even they play the same tune. We will focus on the components of tone and timbre and talk about the Pythogorean scale in the end.