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Those are scales. the highlighted notes (aka the guide tones) are notes in that specific chord that give a harmonic pull towards the next chord. generally they are the 3rd and 7th note (that’s what determines what type of chord it may be: major, minor, major-minor, or dominant). they are the most harmonically important notes in the chord since they determine the quality of the chord itself, so make sure they are in perfect tune.
Answer: D. increased in importance, sometimes providing special effects and overshadowing the voices.
Explanation: In nineteenth-century opera, the orchestra <u><em>increased in importance, sometimes providing special effects and overshadowing the voices</em></u>. An opera is a form of art in which the musicians and the singers combine music and text. It is usually performed in opera houses accompanied by an orchestra. The Romantic period was dominating the arts and the opera. There was a burst of interest for historic themes, supernatural beings, and nationalism, and these theme were displayed in operas.