|Relative key||A minor|
|Parallel key||C minor|
|Dominant key||G major|
|C, D, E, F, G, A, B|
C major (or the key of C) is a major scale based on C, with the pitches C, D, E, F, G, A, and B. C major is one of the most common key signatures used in western music. Its key signature has no flats and no sharps. Its relative minor is A minor and its parallel minor is C minor.
The C major scale is:
On the piano, the C major scale can be played by playing the white keys starting on C.
Twenty of Joseph Haydn's 104 symphonies are in C major, making it his second most-used key, second only to D major. Of the 134 symphonies mistakenly attributed to Haydn that H. C. Robbins Landon lists in his catalog, 33 are in C major, more than any other key. Before the invention of the valves, Haydn did not write trumpet and timpani parts in his symphonies, except those in C major. Landon writes that it wasn't "until 1774 that Haydn uses trumpets and timpani in a key other than C major... and then only sparingly." Most of Haydn's symphonies in C major are labelled "festive" and are of a primarily celebratory mood. (See also List of symphonies in C major.)
Many musicians have pointed out that every musical key conjures up specific feelings. This idea is further explored in a radio program called The Signature Series. American popular songwriter Bob Dylan claimed the key of C major to "be the key of strength, but also the key of regret." Sibelius's Symphony No. 7 is in C major and that key was of great importance in his previous symphonies.
- Johann Sebastian Bach
- Joseph Haydn
- Wolfgang Amadeus Mozart
- 12 Variations in C major on the French song "Ah, vous dirai-je, Maman", KV 265
- Concerto for flute and harp, KV 299/297c
- Piano Concerto No. 8, KV 246 ("Lutzow")
- Piano Concerto No. 13, KV 415
- Piano Concerto No. 21, KV 467
- Piano Concerto No. 25, KV 503
- Piano Sonata No. 1, KV 279
- Piano Sonata No. 7, KV 309
- Piano Sonata No. 10, KV 330
- Piano Sonata No. 16, KV 545
- String Quartet No. 19, KV 465 ("Dissonance")
- Symphony No. 16, KV 128
- Symphony No. 22, KV 162
- Symphony No. 28, KV 200
- Symphony No. 34, KV 338
- Symphony No. 36, KV 425 ("Linz")
- Symphony No. 41, KV 551 ("Jupiter")
- Ludwig van Beethoven
- Franz Schubert
- Felix Mendelssohn
- Frédéric Chopin
- Robert Schumann
- Georges Bizet
- Jean Sibelius
- Maurice Ravel
- Igor Stravinsky
- Symphony in C (1940)
- Sergei Prokofiev
- Dmitri Shostakovich
- Symphony No. 7, Op. 60 ("Leningrad")
- Terry Riley
- H. C. Robbins Landon, The Symphonies of Joseph Haydn. London: Universal Edition & Rockliff (1955): 227. "In the course of composing his first symphonies, the tonality of C major became indelibly impressed on Haydn's mind as the key of pomp, the key of C alto horns, trumpets and timpani, the vehicle for composing brilliant and festive music, although at least during this period [the 1760s] he did not always reserve the tonality of C major for this particular kind of symphony: Nos. 2, 7 and 9, and possibly Nos. 25 and 30 ... are C major symphonies without the psychological manifestations inherent in most of the later works in this key. For the rest, however, the C major path is astonishingly clear; it can be traced from its inception, in Nos. 20, 32 and 37, through No. 33 and the more mature Nos. 38 and 41 to its synthesis in the Maria Theresia (No. 48) and No. 56. It continues with No. 50 and proceeds through Nos. 60, 63, 69, 82 and 90, reaching its final culmination in No. 97."
- James Webster & Georg Feder, The New Grove Haydn. New York: Macmillan (2002): 55. "The Missa in tempora belli ... in C features the bright, trumpet-dominated sound typical of masses in this key."
- "Affective Musical Key Characteristics", Western Michigan University
- Jonathan Cott, ed. (2017). Bob Dylan: The Essential Interviews. New York: Simon & Schuster. p. 237. ISBN 978-1501173196. OCLC 975135582.
- Philip Coad, "Sibelius" in A Guide to the Symphony edited by Robert Layton. Oxford University Press. Sibelius's Seventh "is in C major, and a look back at the previous four symphonies [by Sibelius] will reveal how great the domination of C major has been [in his music]. It is the key of the Third, the relative major of the Fourth and the important 'neutral agent' in its Finale, the key which first forces away the tonic in the Fifth's Finale, and the principal opposition – the key of the brass – in the Sixth. Although it is now the tonic key, C major is also strongly associated with brass in the Seventh Symphony."
- Fanning, David (2001). "Shostakovich: 'The Present-Day Master of the C Major Key'". Acta Musicologica. 73 (2): 101–140. doi:10.2307/932894. JSTOR 932894.
- David Wyn Jones, "The Beginning of the Symphony", in A Guide to the Symphony edited by Robert Layton. Oxford University Press.
- H. C. Robbins Landon, Haydn: The Symphonies BBC Music Guides
- Media related to C major at Wikimedia Commons