1. String instruments:
- Violin: The strings
- Guitar: The strings
- Cello: The strings
- Double bass: The strings
- Harp: The strings
2. Woodwind instruments:
- Flute: The air column inside the tube
- Clarinet: The reed
- Oboe: The reed
- Bassoon: The reed
- Saxophone: The reed
3. Brass instruments:
- Trumpet: The player's lips
- Trombone: The player's lips
- French horn: The player's lips
- Tuba: The player's lips
4. Percussion instruments:
- Drum: The drumhead
- Cymbal: The cymbal itself
- Tambourine: The jingles
- Xylophone: The metal bars
- Marimba: The wooden bars
5. Keyboard instruments:
- Piano: The strings
- Harpsichord: The strings
- Organ: The pipes
6. Electronic instruments:
- Synthesizer: The electronic circuits
- Electric guitar: The strings and the pickups
Please note that this list is not exhaustive and there are many other instruments and variations that exist. The vibrating part of an instrument is what generates the sound waves that we perceive as sound.