…………………is a musical instrument in which sound is produced by setting an air column into vibrations.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a musical instrument that produces sound by setting an air column into vibrations.

2. **Identifying the Concept**: Musical instruments that use air columns to produce sound typically include wind instruments. These instruments create sound by vibrating the air inside them.

3. **Examples of Instruments**: Common examples of such instruments include:
- Flute
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