23. at the beginning of debussy's prélude à "l'après-midi d'un faune," the flute outlines
the interval of a
octave
unison
tritone
fifth

At the beginning of Debussy's Prélude à "L'Après-midi d'un faune," the flute outlines  the interval of a tritone.

Explanation:

Debussy's Prelude starts with the playing of single flute. There are 3 measures. In the piece of measure that is opening  the interval of tritone is outlined by the flute. This is done by playing scale in that descends  from C-sharp to G and then goes back again to C-sharp.

The fee of an ambiguity is imparted from this interval of tritone. The octave is partitioned into two halves. Here F-sharp, which is a tritone is above one C and a tritone below another C.  This similarity in the interval helps the music listeners to identify the pitch that is very important.  

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the style of music that was composed during the classical era was concerto grosso.