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A typical example of a piece in binary form has two large sections of roughly equal duration. The first will begin in a certain key, which will often, (but not always), modulate to a closely related key. Pieces in a major key will usually modulate to the dominant, (the fifth scale degree above the tonic).
[7] For example, G major and D major have four triad chords in common: G major, B minor, D major and E minor. This can be easily determined by a chart similar to the one below, which compares triad qualities. The I chord in G major—a G major chord—is also the IV chord in D major, so I in G major and IV in D major are aligned on the chart.
The term is most widely used [4] as an analytical convenience to denote a portion of a movement identified as an example of classical tonal sonata form. The exposition typically establishes the music's tonic key, and then modulates to, and ends in, the dominant. [5] If the exposition starts in a minor key, it typically modulates to the relative ...
For example, relative to the key of C major, the key of A minor is the submediant. In a major key, the submediant key is the relative minor. Modulation (change of key) to the submediant is relatively rare, compared with modulation to the dominant in a major key or modulation to the mediant (relative major) in a minor key.
In the key of C major, these would be: D minor, E minor, F major, G major, A minor, and C minor. Despite being three sharps or flats away from the original key in the circle of fifths, parallel keys are also considered as closely related keys as the tonal center is the same, and this makes this key have an affinity with the original key.
The second subject group can start in a particular key and then modulate to that key's parallel major or minor. In the first movement of Brahms' Symphony No. 1 (in C minor), the second subject group begins in the relative E ♭ major and goes to the parallel mediant E ♭ minor.
For example, in the key of C major the diatonic mediant and submediant are E minor and A minor respectively. Their parallel majors are E major and A major. The mediants of the parallel minor of C major (C minor) are E ♭ major and A ♭ major. Thus, by this conservative definition, C major has four chromatic mediants: E major, A major, E ...
The first movement of Frédéric Chopin's Piano Concerto in F minor also has a three-key exposition (F minor, A-flat major, C minor). The first movement of the second cello sonata by Brahms also employs a three-key exposition moving to C major and then A minor, the exposition of the first movement of the String Sextet in B flat involves an ...