Multi-room stream music?

Hi, I have a Pi2 and a Pi1 (B) both running OSMC with a shared MySQL library.

I want to play random music on Pi2 (connected to AV amp, but somehow stream that same music to Pi1 outside, connected to some powered speakers.

Is this possible, or are there any add-ons that can do this?

In testing section there is a thread about bluetooth audio streaming, so you could follow it to reach other speaker(s)
Also check this out wifi - Using Pi to stream all audio output from my pc to my stereo - Raspberry Pi Stack Exchange
It could be useful