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In The I chord grounds the key tonality of C Majorthe piece, and often occurs as the C Major first and/or last chord is in the I chordsong and/or smaller passages.
→Harmonic Theory: Tonality and the I Chord
|C Major Chord#Harmonic Theory: Tonality and the I Chord|Theory}}
In any given key, the chord with the same root note as the first note in the scale is the ''<u>I chord'' </u> (that's roman Roman numeral 1, not the letter "eyei"). This Roman numerals are typically used in analysis or composition to indicate a diatonic chord grounds for a common 7-note scale, with the number matching the <u>scale degree</u> (the number at which the tonality of note appears in the piece, and often occurs as scale). Their usage translates to any key - C major is the first and/or last I chord in the song and/or smaller passageskey of C Major, while A major is the I chord of A Major.
=== Tonality ===
[[Music_Theory_Basics#Do_Re_Mi_Fa_So_La_Ti_DoThe_Major_Scale|Earlier]] we began to talk about tonality, calling it the musical equivalent of gravity. We saw that certain melodies felt unresolved and that a few notes within the major scale relieved tension, with the root note providing the fullest resolution. ''<u>Tonality'' </u> describes music that is centered around one particular note, called the ''<u>tonic note''</u>. This cannot exist in a vacuum - it requires a melody or harmonic progression to ''establish'' the tonic note. Some scales or keys are better suited to doing so than others, while some do not establish a tonic note at all.
In the Major scale, the presence of the perfect 4th and 5th in combination with the leading tone (7th note a half step below the tonic) strongly establishes the tonality of the scale. Melodies that are derived from this scale find the strongest resolution and finality by moving from the leading tone to the tonic note. Scales that do not have a leading tone can still find resolution to the tonic in other ways; however, it is simply not as strong as the major scale's resolution.