Proportion - A term used in Arithmetic to express certain harmonious relations existing between the several elements of a series of numbers; and transferred from the terminology of Mathematics to that of Music, in which it plays a very prominent part.
Harmony - is the process by which the composition of individual sounds, or superpositions of sounds, is analysed by hearing. Usually, this means simultaneously occurring frequencies, pitches, or chords.
Rhythm - means a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions"
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Proportion - A term used in Arithmetic to express certain harmonious relations existing between the several elements of a series of numbers; and transferred from the terminology of Mathematics to that of Music, in which it plays a very prominent part.
Harmony - is the process by which the composition of individual sounds, or superpositions of sounds, is analysed by hearing. Usually, this means simultaneously occurring frequencies, pitches, or chords.
Rhythm - means a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions"