C major

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 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:
\override Score.TimeSignature #'stencil = ##f
\relative c' {
 \clef treble \key c \major \time 7/4 c4 d e f g a b c b a g f e d c2
</score>
On the piano, the C major scale can be played by playing only the white keys starting on C.
Compositions.
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. Wilfrid Mellers believed that Mozart's Symphony No 41, written in 'white' C major, "represented the triumph of light". (See also List of symphonies in C major.)
Many masses and settings of "Te Deum" in the Classical era were in C major. Mozart and Haydn wrote most of their masses in C major. Gounod (in a review of Sibelius' Third Symphony) said that "only God composes in C major". Six of his own masses are written in C.
Of Franz Schubert's two symphonies in the key, the first is nicknamed the "Little C major" and the second the "Great C major".
Scott Joplin's "The Entertainer" is written in the key of 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.