Here is the sentence:

Waves that crash against the shore, chanting monks, and chirping birds are the sound files Wendell enjoys on his iPod.

When you list grammatical items, you must use parallel structure. Here, chanting monks and chirping birds are both noun phrases, but waves that crash against the shore is a noun modified with a relative clause, which wrecks the parallelism. Well done, grammar gourmet!

To fix the sentence, change waves that crash against the shore to crashing waves.

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