1st7ths

1st7ths is a musical interval consisting of a perfect fifth and a major third played simultaneously. It is often described as a rich, consonant sound. When a root note is played along with a perfect fifth and a major third above it, this forms a major triad. The 1st7ths, when used as a standalone chord, typically implies a root, a fifth, and a third.

This interval is fundamental in Western music theory and is a cornerstone of harmony. It is the basis for many chords and progressions. The specific spelling of 1st7ths can vary depending on the context, but its sonic quality remains consistent. The term "1st7ths" is not a standard music theory term but rather a descriptive way to refer to the combination of a perfect fifth and a major third above a root.

The perfect fifth is an interval of seven semitones, and the major third is an interval of four semitones. When combined, they create a sound that is considered stable and pleasing to the ear. This interval is a building block for melodies and harmonies, appearing in countless musical compositions across various genres. Its prevalence underscores its importance in creating musical structure and emotional impact. The perception of 1st7ths as consonant is rooted in its harmonic properties and its frequent use in tonal music.