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In music, the tonic is the first scale degree of a diatonic scale and the tonal center or final resolution tone.〔Benward & Saker (2003), p.33.〕 The triad formed on the tonic note, the tonic chord, is thus the most significant chord. More generally, the tonic is the pitch upon which all other pitches of a piece are hierarchically referenced. Scales are named after their tonics, thus the tonic of the scale of C is the note C. Simple songs may begin and end on the tonic note. The tonic is often confused with the root, which is the reference note of a chord, rather than that of the scale. It is also represented with the Roman numeral I. ==Importance and function== In western European tonal music of the 18th and 19th centuries, the tonic center was the most important of all the different tone centers which a composer used in a piece of music, with most pieces beginning and ending on the tonic, usually modulating to the dominant (the fifth above the tonic, or the fourth note down from the tonic) in between. Two parallel keys have the same tonic. For example, in both C major and C minor, the tonic is C. However, relative keys (two different scales that share a key signature) have different tonics. For example, C major and A minor share a key signature that feature no sharps or flats, despite having different tonic pitches (C and A, respectively). ''Tonic'' may be reserved exclusively for use in tonal contexts while ''tonal center'' and/or ''pitch center'' may be used in post- and atonal music: "For purposes of non-tonal centric music, it might be a good idea to have the term 'tone center' refer to the more general class of which 'tonics' (or tone centers in tonal contexts) could be regarded as a subclass."〔Berger (1963), p. 12. cited in Swift, Richard. "(A Tonal Analog: The Tone-Centered Music of George Perle )", p.258. ''Perspectives of New Music'', Vol. 21, No. 1/2, (Autumn, 1982 - Summer, 1983), pp. 257-284.〕 Thus a pitch center may function referentially or contextually in an atonal context, often acting as axis or line of symmetry in an interval cycle. ''Pitch centricity'' was coined by Arthur Berger in his "Problems of Pitch Organization in Stravinsky". The tonic diatonic function includes 4 separate activities or roles as the principal goal tone, initiating event, generator of other tones, and the stable center neutralizing the tension between dominant and subdominant 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tonic (music)」の詳細全文を読む スポンサード リンク
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