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A chord, in music, is any harmonic set of usually three or more notes (also called pitches) that is heard as if sounding simultaneously. In everyday use by musical ensembles such as bands and orchestras, the three or more notes of a chord are often sounded together.
Intervals are one of the essential elements of music, the building-blocks that make up its structures. Melodies, scales, and chords are all patterns of melodic or harmonic intervals, and the notes in any given key belong to that key because of their interval relationships.