Triad: A triad is a chord consisting of three notes, typically a root, a third, and a fifth. These notes are stacked in intervals of thirds.
Context and Significance
Triads are foundational in Western music, forming the basis for harmony and chord progressions. They appear across genres, from classical to pop, providing structure and depth to compositions. On the piano, guitar, and other polyphonic instruments, triads create harmony and support melodies. Their versatility allows musicians to develop complex musical ideas, making them essential in both composition and performance.
Historical Background
The use of triads can be traced back to the Renaissance period, where they became prominent in the development of tonal harmony. The formalization of triads as a theoretical concept expanded in the Baroque era, as composers like Johann Sebastian Bach utilized them extensively in their works. Triads remain a cornerstone of music theory, integral to understanding harmonic relationships.
Examples
In Beethoven’s Symphony No. 5, the opening motif uses a minor triad, creating dramatic tension. In pop music, The Beatles’ “Let It Be” features simple triadic progressions that contribute to its memorable sound. Jazz musicians often expand and alter triads for improvisation, demonstrating their adaptability.
Related Terms
Seventh Chord: A triad with an added seventh interval.
Diatonic Triads: Triads built on each scale degree.
Inversion: Rearranging the order of triad notes.