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In music, the tonic is the first scale degree () of the diatonic scale (the first note of a scale) and the tonal center or final resolution tone that is commonly used in the final cadence in tonal (musical key-based) classical music, popular music, and traditional music. In the movable do solfège system, the tonic note is sung as do. More generally, the tonic is the note upon which all other notes of a piece are hierarchically referenced. Scales are named after their tonics: for instance, the tonic of the C major scale is the note C.

The triad formed on the tonic note, the tonic chord, is thus the most significant chord in these styles of music. In Roman numeral analysis, the tonic chord is typically symbolized by the Roman numeral "I" if it is major and by "i" if it is minor.

In very much conventionally tonal music, harmonic analysis will reveal a broad prevalence of the primary (often triadic) harmonies: tonic, dominant, and subdominant (i.e., I and its chief auxiliaries a 5th removed), and especially the first two of these.

— Berry (1976)

These chords may also appear as seventh chords: in major, as I, or in minor as i or rarely i:

The tonic is distinguished from the root, which is the reference note of a chord, rather than that of the scale.

Importance and function

In music of the common practice period, 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 scale degree above the tonic, or the fourth below it) 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).

The term tonic may be reserved exclusively for use in tonal contexts while tonal center or pitch center may be used in post-tonal 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." Thus, a pitch center may function referentially or contextually in an atonal context, often acting as an axis or line of symmetry in an interval cycle. The term pitch centricity was coined by Arthur Berger in his "Problems of Pitch Organization in Stravinsky". According to Walter Piston, "the idea of a unified classical tonality replaced by nonclassical (in this case nondominant) centricity in a composition is perfectly demonstrated by Debussy's Prélude à l'après-midi d'un faune".

The tonic includes four 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.

See also

• Final (music)
• Fundamental frequency – Lowest frequency of a periodic waveform, such as sound
• Double tonic
• Key
• Subtonic
• Supertonic

References

1. Benward, Bruce; Saker, Marilyn (2009). "Scales, Tonality, Key, Modes". Music in Theory and Practice (8th ed.). McGraw Hill. p. 28. ISBN 978-0-07-310187-3.
2. Berry, Wallace (1976/1987). Structural Functions in Music, p. 62. ISBN 0-486-25384-8.
3. Kostka, Stefan; Payne, Dorothy (2004). Tonal Harmony (5th ed.). Boston: McGraw-Hill. p. 234. ISBN 0072852607. OCLC 51613969.
4. Berger (1963), p. 12. cited in Swift, Richard (Autumn 1982 – Summer 1983). "A Tonal Analog: The Tone-Centered Music of George Perle". Perspectives of New Music. 21 (1/2): 257–284 (258). doi:10.2307/832876. JSTOR 832876.
5. Samson, Jim (1977). Music in Transition: A Study of Tonal Expansion and Atonality, 1900–1920. New York City: W. W. Norton. ISBN 0-393-02193-9. OCLC 3240273.
6. Berger, Arthur (Fall–Winter 1963). "Problems of Pitch Organization in Stravinsky". Perspectives of New Music. 2 (1): 11–42. doi:10.2307/832252. JSTOR 832252.
7. Piston, Walter (1987/1941). Harmony, p. 529. 5th edition revised by Mark DeVoto. W. W. Norton, New York/London. ISBN 0-393-95480-3.

External links

• Media related to Tonic (music) at Wikimedia Commons

v t e Chords
By form	Triad Major Minor Augmented Diminished Suspended Seventh Leading-tone Major Minor Dominant Dominant seventh flat five Diminished Half-diminished Diminished major Minor-major Augmented major Augmented minor Altered seventh Nondominant Harmonic seventh Extended Ninth Eleventh Thirteenth Upper structure Dominant 7♯9 Polychord Tone cluster Added / omitted Sixth Augmented sixth Lydian Seven six Specific Alpha Bridge Complexe sonore Dream Elektra Farben Grandmother Magic Mystic Northern lights Petrushka Psalms So What Tristan Viennese trichord General Mixed interval Secundal Tertian Quartal Synthetic chord Tetrad
By function	Diatonic Tonic Supertonic Mediant Subdominant Dominant Submediant Leading tone / Subtonic Altered Approach Borrowed Chromatic mediant Neapolitan Passing Secondary Secondary dominant Secondary leading-tone Secondary supertonic Other Common Contrast Primary triad Subsidiary Substitute
Techniques	Barre Block Chordioid Chord-scale system Guitar Open Power Slash
Other	Arpeggio Chord names and symbols List of chords Factor

• Scale degrees
• Diatonic functions