acordes

Acordes, commonly referred to as chords, are groups of notes designed to be heard together to form harmony. In Western music, most acordes are built by stacking intervals of thirds above a root note, producing a sonority whose structure supports melody and rhythm.

Triads are the simplest acordes and consist of three notes. The major triad stacks a major third and a minor third above the root (for example C–E–G). The minor triad lowers the third (A–C–E); the diminished triad lowers both the third and the fifth (B–D–F); the augmented triad raises the fifth (C–E–G#).

Beyond triads, chords often include a seventh or more. Seventh chords add a note a seventh above the root: examples include C major seventh (C–E–G–B), C dominant seventh (C–E–G–B♭), and C minor seventh (C–E♭–G–B♭). Extensions add further tones beyond the seventh, such as ninth, eleventh, and thirteenth chords, which diversify harmony and color.

Inversion and voicing affect how acordes are presented. Chords can be in root position or inverted, altering the bass note while retaining the same chord structure. Notation typically uses roman numerals (I, ii, V) to indicate function in classical harmony or chord symbols (C, Dm, G7) in popular and jazz styles. Voicing choices influence smooth bass lines and timbral balance in a progression.

Acordes are central to harmony across styles and are governed by conventions of tonal harmony in common-practice periods, though practice varies by genre and cultural context.