Each aspect of music is explained through the five propositions. The first proposition says that the fundamental property of all music is sound. All over the world, music is distinguished by the sound emanating from singers. In other words, there cannot be music without a sonic aspect. Not all sounds can be musical sounds. A musical sound is a sound whose primary identity is a musical identity and is normally called tonality. Other sounds such as noise, ambient sounds and vocal sounds are excluded from music sounds. For every musical sound, there are four basic properties. These are frequency, duration, aptitude and timbre. In musical terms, the four properties are called pitch, length, volume, and sound quality, respectively. It is also important to note that tones are defined by the surrounding musical environment. The relationship between sounds and the musical environment gives rise to chords, melodies, textures and rhythms. Sounds have different meanings depending on their cultural significance. For example, a piece of music has a different cultural meaning when used in a fast food advertisement than when used in a religious setting. Such music captures different types of imagination of listeners. All sounds have the potential to become musical sounds if matched and arranged systematically. A good example of such music is John Cage's 4'33 whose lack of sound led to an assortment of chair squeaks, coughs and air conditioning hums that generated musical ambiance.