I have visited this museum once with my family when we had been to Mysore. This place is not so very famous, but if you carefully note, this is the first wax museum dedicated for musical instruments and music.
The models here are wonderfully sculpted and are so realistic that your eyes might get fooled for a minute.
You can find different Bands from around the world playing different instruments(statues of course). There is light music turned on in the museum.
The museum is not very big or fancy, but an old building well maintained with good staff and affordable entry fee.
You can spend at most 2 hours in the museum and not more. At the end of the museum, you find a candle store where you will find beautifully designed candles for reasonable prices. It is cool inside the museum as the sculptures are made of wax.
I would recommend this place to everyone visiting Mysore and I wish the government had given a little more importance to this place and maintained better.