Major 7th chord (MM or M7)

Dominant 7th chord: A dominant 7th chord is similar to a major 7th chord but with a minor seventh interval instead of a major seventh. It has a strong and tense sound.

Major-minor 7th chord: Also known as the dominant-7th chord, it combines a major triad with a minor seventh interval. It has both brightness and tension in its sound.

Minor 7th chord: A minor 7th chord consists of a minor triad with an added minor seventh interval. It has a melancholic and mellow sound.