Description: intervals smaller than a semitone.
Notation: Notation methods vary, but these examples are typical of quartertones and raised & lowered inflections.
Comments: Quartertones and microtones are produced by using 'fake' fingerings and/or by adjusting the embouchure.
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Oboe microtones.
Multiphonics
Description: playing chords - more than one note at a time.
Notation: Write the bottom note of the chord and the word 'chord' above. Occasionally composers write all the notes of the chord that they wish to hear and/or provide a fingering diagram.
Comments: There are many possible multiphonics on both oboe and cor anglais however instruments and players vary in the multiphonics they can find.
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Oboe multiphonics.
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Cor anglais multiphonics.
Circular Breathing
Description: sustaining a note whilst breathing in through the nose.
Notation: verbal instruction in the music.
Comments: Although this is easier on double reed instruments than most others, it should be regarded as an unusual technique and players should be consulted before it is used!
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Circular breathing on the cor anglais.