The 7 chord, or dominant 7th chord, is a four-note chord that introduces a bluesy or jazzy feel to a progression. This chord is built on the major triad by adding a minor seventh interval from the root. For example, in a G7 chord, you would play the notes G, B, D, and F. The seventh note (F in this example) creates tension and a sense of wanting to resolve, making it crucial in various musical genres, particularly jazz, blues, and rock. Guitarists should be aware that the dominant 7th chord is generally represented with just the numeral 7 after the root note. When playing this chord, focus on the unique sound of the dissonant seventh, which distinguishes it from the simple major chord, and be ready to hear its compelling urge to move to the tonic or resolve in the progression. Understanding the finger positions for different 7 chords across the fretboard can expand your ability to exploit this chord's dynamic range and flavor.