This is the sound of the monero network.

Whenever somebody makes a transaction you will hear one of the drums
( ).

When a block is found you will hear the ride cymbal ( ).

Monero network is still a bit quiet and
the server beer costs money monero
so hit the drum by donating:
494QjYxqKshbG4YjsAEYfE4d5YaCvgqHp2DQfPtLT8wajjBwFcsbVo1eCa461i5ukGSKwdUcATmx241iQ6h7THdF2v9oJNn
or donate bitcoin:
1BPhfkwa1vdDpzrD4GKUPYxVwFiJqap7ka