Right now we don't have a feature to directly stream music. It is definitely on our wish list. In the mean time, here are a few options:

Low Tech

Use a separate computer and sign in as a "DJ" to pipe music into the room by playing the DJ's avatar on a spotlight space.

Semi-Low Tech

Use the Sync'd TV option to broadcast a very long YouTube video.


Many people have recommended the 3rd-party application VB Cable if you want to both talk and share audio:

Warning: We do not provide support in regards to 3rd-party tools or applications.

Technical (Mac only)

Many people have recommended the 3rd-party application Soundflower that allows you to redirect your outputs to your inputs. It's a fairly old program, so it might be a bit clunky to use.
  1. Download the system extension (do read the "Please Read" section):
  2. Download the latest SoundFlowerBed (an app for the menu bar that allows you to quickly choose input/output redirect):
  3. To redirect output to Soundflower, open SoundFlowerBed, and under "Soundflower (2ch"), choose your output device. (For me it's just "Built-In Output.")
  4. To make your mic play from Soundflower (which is now taking your audio out as its input), just choose "Soundflower (2ch)"as the source in your mic setup on Gather.
This setup assumes you have a dedicated device acting as the avatar and running the background music. In this scenario your only fidelity loss would be due to the connection, not due to the quality of your device mic.