In music theory, the terms major 7th, dominant 7th, minor 7th, and diminished 7th refer to different types of seventh chords. Here’s a brief explanation of each: 1. Major 7th chord: This chord consists of a root note, a major third, a perfect fifth, and a major seventh. For example, in the key of C major, a Cmaj7 chord would include the notes C-E-G-B. 2. Dominant 7th chord: This chord has a root note, a major third, a perfect fifth, and a minor seventh. In the key of C major, a C7 chord would co