[MattGrommes]

Did you have to use the USB bluetooth adapter with a Pi 3? I know the 3 has bluetooth but I don't know enough about it to know if I can just connect my phone to it to play music. I want to do something very similar to what you've done so I'm excited to see that somebody else succeeded.

[davexunit]

I used the very first version of the Raspberry Pi model B. I bought one when they became available years ago and then never did anything with it. If the Pi 3 comes with a bluetooth chip built-in then you will just need to do some software configuration. There are three servers to configure: bluez, udev, and pulseaudio. I used the following gist as a guide, but didn't follow every step exactly:

https://gist.github.com/oleq/24e09112b07464acbda1

Hope this helps!

[btschaegg]

I did the same thing using a HifiBerry-Hat (used the Pi as a Mopidy server before, but I like the Bluetooth setup better for UI reasons).

If you're using BlueZ and Pulseaudio, it comes down to a couple of simple config entries (google for Linux Bluetooth A2DP Sink).

I used a RPi 2 with a USB Dongle for the Bluetooth though, so I can't vouch for the internal Bluetooth of the RPi 3.