Turn your sound on. There’s a weird sound when you put water in a steel bowl…

Short video that demonstrates the sound change well.

https://www.reddit.com/r/Whatisthis/comments/s064l0/turn_your_sound_on_theres_a_weird_sound_when_you/

Weird noise made using a metal bowl filled with water

demonstration

https://youtu.be/N255WPwvT7M?feature=shared

Acoustically excited vibrations in a liquid-filled cylindrical tank

Flexural vibrations of a cylindrical steel tank filled with water are considered theoretically and compared with experimental measurements made on a model tank which is acoustically excited.

https://www.sciencedirect.com/science/article/pii/0022460X71906067?via%3Dihub

The Dynamics of Tibetan Singing Bowls

Physical model of axisymmetric shells subjected to impact and friction-induced excitations and experimental mode identification of three different Tibetan bowls.

https://www.ingentaconnect.com/content/dav/aaua/2006/00000092/00000004/art00017#

Tibetan singing bowls

Experimental investigation of the acoustics and fluid dynamics of Tibetan singing bowls.

https://arxiv.org/pdf/1106.6348