Name two musical instruments which produce sound by vibrating strings?

Explanation

**Step-by-Step Solution:**

1. **Identify the Requirement**: The question asks for two musical instruments that produce sound by vibrating strings.

2. **Recall Knowledge of Musical Instruments**: Think about various musical instruments that use strings to create sound.

3. **Select the First Instrument**: One popular instrument that produces sound through vibrating strings is the **Guitar**.

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