Music is produced when a musical instrument causes the air around it to vibrate. The vibrations in air are called traveling longitudinal waves, which we can hear.

Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively. So all music is literally sculpted air.

The interplay of interference, standing waves, transverse waves, fundamental frequencies and overtones produces music that we all enjoy.

Check this incredible ‘Sea Organ’ that uses ocean waves to make beautiful music.

Here is a patent on an artificial waterfall echo chamber that produces echoes of different pitch and intensity as water falls on the assembly.

US7575181