Harmony

"Harmony is the concept of combining different sounds together in order to create new, distinct musical ideas."

"A particular emphasis on harmony is one of the core concepts underlying the theory and practice of Western music."

"Harmony is broadly understood to involve both a 'vertical' dimension (frequency-space) and a 'horizontal' dimension (time-space)."

"Harmony often overlaps with related musical concepts such as melody, timbre, and form."

"The study of harmony involves the juxtaposition of individual pitches to create chords, and in turn the juxtaposition of chords to create larger chord progressions."

"In the physiological approach, consonance is viewed as a continuous variable measuring the human brain's ability to 'decode' aural sensory input."

"Culturally, consonant pitch relationships are often described as sounding more pleasant, euphonious, and beautiful than dissonant pitch relationships."

"In many types of music, notably baroque, romantic, modern, and jazz, chords are often augmented with 'tensions'."

"A tension is an additional chord member that creates a relatively dissonant interval in relation to the bass."

"The notion of counterpoint seeks to understand and describe the relationships between melodic lines, often in the context of a polyphonic texture of several simultaneous but independent voices."

"Typically, in the classical common practice period, a dissonant chord 'resolves' to a consonant chord."

"Harmonization usually sounds pleasant to the ear when there is a balance between consonance and dissonance."

"Simply put, this occurs when there is a balance between 'tense' and 'relaxed' moments."

"Dissonance is an important part of harmony when dissonance can be resolved and contribute to the composition of music as a whole."

"A misplayed note or any sound that is judged to detract from the whole composition can be described as disharmonious rather than dissonant."

"Harmonic objects such as chords, textures, and tonalities are identified, defined, and categorized in the development of these theories."

"The principles of connection that govern these structures have been the subject of centuries worth of theoretical work and vernacular practice alike."

"Drawing both from music theoretical traditions and the field of psychoacoustics, its perception in large part consists of recognizing and processing consonance."

"In popular and jazz harmony, chords are named by their root plus various terms and characters indicating their qualities."

"A concept whose precise definition has varied throughout history, but is often associated with simple mathematical ratios between coincident pitch frequencies."