Stream audio from PC to smartphones?

Question

For Christmas 2016, me and my dad want to do a Lightshow for our neighborhood with lights and music.

We have the lights set up, but the music is a problem. We don't want to put huge speakers in our garden because that would be very annoying for our densely populated neighborhood.

So, we came up with this concept:

The computer (Windows 7) handles the lights with a sequencer from Light-o-rama.

Now my question is:
How can I stream audio from the PC to the smartphones?
I can figure out the smartphone end myself, but the streaming audio from PC is the thing here.

The solution can be anything! But I can't seem to figure it out! Relevant languages I can do are:

1. C++
2. C#
3. Java
4. NodeJS
5. ASP.NET

But it can also be a program that already can do this!

EDIT:
THIS IS A MUST: Lights and music have to stay in sync! The lights dance to the music

Anything helps! Thx in advance!

EDIT:
I have awarded the in my eyes most fitting solution to this case the bounty, however, I haven't had the time to test all of the posted solutions. I will try to try every single one of them and then select that answer as the solution! Please see my comment underneath the answer which has the bounty! Thx all for the help!

Answer 1

If you can get everyone to download this app: SoundWire you can stream audio from Windows to any Android phone (assuming your friends are cool)

Check it out looks pretty cool, you can even stream a youtube video and get the audio synced up with any android smartphone