The dominant of C major is G major. In music theory, the dominant is the fifth scale degree of a major or minor scale. It is called the dominant because it has a strong tendency to resolve to the tonic, which is the first scale degree.

In the key of C major, the G major chord (G-B-D) is built on the dominant scale degree. This chord is important in establishing the tonality and creating tension that eventually resolves back to the tonic chord (C-E-G). The dominant chord is often used to create a sense of movement and anticipation in music.

One common progression that highlights the dominant-tonic relationship is the V-I progression. In the key of C major, this would be the G major chord (dominant) resolving to the C major chord (tonic). This progression is frequently used in various musical genres and can be found in countless songs.

For example, the chorus of the popular song "Let It Be" by The Beatles features a V-I progression in the key of C major. The line "Let it be, let it be, let it be, let it be" starts with a G major chord and resolves to a C major chord. This resolution creates a sense of resolution and stability.

Another example can be found in classical music. In Beethoven's Symphony No. 5, the famous opening motif consists of a G major chord followed by a C major chord. This initial dominant-tonic progression sets the foundation for the entire symphony and creates a sense of tension and release.

References:

• Benward, B., & Saker, M. (2003). Music in theory and practice (Vol. 1). McGraw-Hill.
• Piston, W. (1987). Harmony. W. W. Norton & Company.
• Everett, W. (2004). The Beatles as musicians: The Quarry Men through Rubber Soul. Oxford University Press.