Which seventh chord is created from a major chord plus a minor seventh?

The seventh chord that is formed by combining a major chord with a minor seventh is called a Dominant 7th chord. In this context, a major chord consists of the root, major third, and perfect fifth. By adding a minor seventh above the root, which is a whole step below the octave, you create the distinctive sound of the Dominant 7th chord.

For example, if you start with a C major chord (C-E-G) and add B♭ (the minor seventh), you generate the chord C7, which consists of the notes C-E-G-B♭. This specific combination is crucial in tonal music, particularly in creating tension that resolves to the tonic chord, hence its significant role in harmony.

Other seventh chords, such as Major 7th, Minor 7th, and Diminished 7th, have different structures. A Major 7th includes a major third and a major seventh, a Minor 7th has a minor third and a minor seventh, and a Diminished 7th includes a minor third and a diminished seventh. Each of these chords yields a unique sound that fits different harmonic contexts, but none match the structure introduced in the question as accurately as the Dominant