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Diverging and converging progressions 113 Tone quality as a harmonic force. Harmonic basis 114 Artificial effects 116 Use of percussion instruments for rhythm and colour 117 Economy in orchestral colour 118   Chapter V.—Combination of the human voice with orchestra. The Stage band   Orchestral accompaniment of solo voices 119 General remarks 119 Transparence of accompaniment. Harmony 120 Doubling voices in the orchestra 122 Recitative and declamation 125 Orchestral accompaniment of the chorus 126 Solo voice with chorus 128 Instruments on the stage and in the wings 129   Chapter VI (Supplementary).—Voices   Technical terms 132 Soloists 133 Range and register 133 Vocalisation 134 Vowels 136 Flexibility 137 Colour and character of voices 137 Voices in combination 139 Duet