Mathematics and Art - Tampering for Confirmation

So with a idea in mind and what to do I set out some time apart today for Mathematics and Art. Finding time for my mum out of the kitchen I went in and did a little experimenting. Looking around I found my glass measuring jug so I could determine exact values for the volumes of water. Next I grabbed a metallic chopstick for maximum vibration sounds and effect and basically started with no water in the jug and tapped the side with the chopstick. Now I was certain I could create different notes with this idea but unfortunately I now had to wait for tomorrow to confirm more results as my mum needed the kitchen back for dinner. So it was a definite that the more water I had the lower the note. And the smaller amount of water in the container the higher the note.