<P> A key relationship is the relationship between keys, measured by common tone and nearness on the circle of fifths . See closely related key . </P> <P> The key usually identifies the tonic note and / or chord: the note and / or major or minor triad that represents the final point of rest for a piece, or the focal point of a section . Though the key of a piece may be named in the title (e.g., Symphony in C major), or inferred from the key signature, the establishment of key is brought about via functional harmony, a sequence of chords leading to one or more cadences, and / or melodic motion (such as movement from the leading - tone to the tonic). For example, the key of G includes the following pitches: G, A, B, C, D, E, and F ♯; and its corresponding tonic chord is G--B--D. Most often at the beginning and end of traditional pieces during the common practice period, the tonic, sometimes with its corresponding tonic chord, begins and ends a piece in a designated key . A key may be major or minor . Music can be described as being in the Dorian mode, or Phrygian, etc., and is thus usually thought of as in a specific mode rather than a key . Languages other than English may use other key naming systems . </P> <P> People sometimes confuse key with scale . A scale is an ordered set of notes typically used in a key, while the key is the "center of gravity" established by particular chord progressions . </P> <P> Notes and chords within a key generally come from the major or minor scale associated with the tonic triad, but may also include borrowed chords, altered chords, secondary dominants, and the like . All these notes and chords, however, are used in conventional patterns that establish the primacy of the tonic note and triad . </P>

Music that centers around one main note of the major or minor scale is called