Could you please give an example of cacophony in The Great Gatsby?It can be found anywhere in the book.

A cacophony is a harsh, discordant mixture of sounds;
a din, racket, noise, clamor, discord, dissonance, discordance,
uproar.

In The Great Gatsby, the best
examples of cacophony come in Chapter 3, during Gatsby's party.  The atmosphere is like
a Roman Carnival: a bunch of drunk people, couples fighting, a full orchestra,
out-of-control dancing, cars crashing, and lots of booze clanking
about.

Here's a sample:

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There was dancing now on the canvas in the
garden; old men pushing young girls backward...and a great number of single girls
dancing individualistically or relieving the orchestra for a moment of the burden of the
banjo or the traps. By midnight the hilarity had increased.
A celebrated tenor had sung in Italian, and a notorious contralto had sung in jazz, and
between the numbers people were doing “stunts” all over the
garden, while happy, vacuous bursts of laughter rose toward
the summer sky.

Later, we
hear the car wreck:

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However, as they had left their cars blocking
the road, a harsh, discordant din from those in the rear
had been audible for some time, and added to the already violent
confusion of the
scene.

In this chapter,
Fitzgerald vividly describes the reckless and careless behavior of the party-goers.  The
car accident will foreshadow the one later in the book when Daisy runs over Myrtle.
 Like Nick, we are being introduced to the decadence of the Jazz
Age.