Briefly how each instruments work?

Certainly!

1. Piano: When a key is pressed, it triggers a hammer to strike strings inside the instrument, creating sound through vibration. The pitch varies based on the string's length and tension.

2. Guitar: Sound is produced when strings are plucked or strummed, causing them to vibrate. The body of the guitar amplifies these vibrations, and the pitch changes with string thickness and tension.

3. Violin: A bow made of horsehair is drawn across the strings, causing them to vibrate and produce sound. The pitch is altered by finger placement on the fingerboard, changing the vibrating length of the strings.

4. Flute: Air is blown across an opening, creating vibrations within the tube of the instrument. The pitch is adjusted by opening and closing finger holes, altering the effective length of the air column.