Since every diatonic collection can be used for two relative keys, you must now also memorize fifteen minor key signatures in addition to the fifteen major key signatures you memorized in Unit 6. Here are the scales from two relative keys-C major and A minor-written so you can see the different placement of their scale degrees within the same diatonic collection: Any two keys that share the same key signature are called RELATIVE KEYS (also called RELATIVE MODES). The second video then discusses some specific minor-mode concepts.Įvery diatonic collection contains one major tonic and one minor tonic. The first video below discusses “minor” in terms of the “modes,” a concept we’ll return to in Unit 14. Thus, we would say that the excerpt above is in “E minor.” From now on, we will name keys using their tonic and mode, in that order. These two types of tonicization are called MODES - major mode and minor mode. The names major and minor are ways of referring to two different tonicizations within a diatonic collection. This new tonic is called the MINOR TONIC. In the one-sharp collection, given by the key signature, this new tonic (E) lies a minor third below (or a major sixth above) the major tonic (G). Listen to this phrase: not only will G not seem like “home,” but the melody will feel darker than the major melodies we’ve worked with so far. While the notes and key signature look like G major, the pitch E seems more central to the melody. But a second pitch within each diatonic collection may alternatively serve as a tonic. You associated each diatonic collection (the pitches given by a key signature) with a single pitch that - when it’s the tonic - results in a major key. In Unit 6, you learned about (and memorized) the relationships between key signatures and major keys. This chapter shows that tonic and collection can be changed independently, which results in different modes. In previous units, every diatonic collection and its key signature have been associated with only one tonic, and all scales have had the same intervals between their scale degrees.
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