What has keys but can't open locks, and can create harmony without a voice?

Category: Wordplay · Difficulty: hard

Hint: Think about instruments and music.

Answer

A piano or guitar

Explanation

The riddle plays on the word 'keys' referring to piano keys, which do not open locks but create music.

This is a hard wordplay riddle — a tricky one that takes a little thought. The answer is A piano or guitar.

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