There are several ways to identify seventh chords.

1. Identify the triad and the seventh interval that make up the chord:

See: identifying triads

2. By determining the key and the degree on which the chord is built:

In this case, it is a dominant seventh chord because the key is D major and the chord is built on the fifth degree. In major keys, a dominant seventh chord is built on the fifth degree.


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José Rodríguez Alvira.