how a crystal glass creates musical sound when rim of the glass filled with water is stroke?

Answer 1

Yes vibrations of all objects is the source of hearing their sounds, whether its the vibration of a humans vocal chords, a violin string or the hum of your refrigerator.

But the crystal's sound has a few things involved to make it music.

Crystal is more "springy" than regular glass. So it is prone to resonate better.

The water level in the glass will change the mass of the system and that will change the frequency where that resonance occurs.
Stroking the rim with your finger will "squeek" in a way that is actually very similar to scratching a blackboard. But instead of several frequencies that hurt your ears, the frequency that is equal to the resonant frequency of the crystal glass will come through. Just like stroking a violin string. So setting the water level allows you to tune the system to a specific musical note.

GP has answered well about the reinforcement of resonance.

Answer 2

The glass is very rigid and has a "resonance", which means small motions will be amplified by the glass at a certain frequency. When the edge of the glass is stroked, the friction produces vibrations of the glass which are reinforced at the resonant frequency, so a single tone is heard. If the rim is too smooth, or there is oil on the rim, vibrations will not occur and no tone will be produced. Therefore, the glass and the finger must both be very clean. A small amount of water on the rim helps.

Answer 3

by vibration