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:
or donate bitcoin:
About & credits
Monero is a secure, private, untraceable currency.
It is open-source and freely available to all.
Read more here.