![]() Not only is the dominant 7th chord unique to its key, but as we've seen in previous lessons it also has a powerful pull to its related tonic chord. Hearing it immediately helps establish tonality, or what key you're in. It could be in one of two keys.īut, a dominant 7th chord only exists in one key. Similarly, if you hear a major 7th chord, it could be a I or IV. Without more context-other chords around it or a melody-a minor 7th chord's key is ambiguous. That minor 7th chord could exist in 3 different major keys. If you hear a minor 7th chord by itself, you don't know if it is the ii, iii or vi chord in a major key. Let me explain what that means.Įach key only has one dominant 7th and, when a listener hears a dominant 7th, it helps put their ear in that key. Why? One reason is that the dominant 7th defines its key. The dominant 7th chord is a very important chord.
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