This shows how a harp can be played.
This video shows how violins can be played in different ways.
The cello can sound in differents ways:
This music can be played by a flute
ORCHESTRA GAME:
http://www.musicgames.net/livegames/orchestra/orchestra2.htm
ORCHESTRA INFO:
https://www.knowitall.org/series/be-music-critic?page=1
The piano: