'function' is the functional reading: the tonic, the dominant and the
chords that cadence are the frame. 'duration' is the salience reading: a
chord is the frame when it outlasts the chords around it — its length beats
the median of the other chords' — whatever function it carries. Nothing
outlasts anything in an even harmonic rhythm, so a loop or a vamp protects no
chord by length and the two figures decide, as they do under either reading.
What a reduction treats as the frame.
'function'is the functional reading: the tonic, the dominant and the chords that cadence are the frame.'duration'is the salience reading: a chord is the frame when it outlasts the chords around it — its length beats the median of the other chords' — whatever function it carries. Nothing outlasts anything in an even harmonic rhythm, so a loop or a vamp protects no chord by length and the two figures decide, as they do under either reading.