Awesome

Announcement

I'm no longer developing Soundcast. I strongly recommend a newly available commercial solution that works flawlessly and includes all of the features people were asking for Soundcast:

• Automatic synchronized playback using as many devices as you wish (Chromecast, Apple TV, Airport Express, Bluetooth, iOS, Linux, etc)
• Sends cover artwork for the currently playing song to the TV
• Allows to optionally stream only a specific app's audio (eg. Spotify, Apple Music), so system sounds won't interfere with music
• Allows changing the streaming volume (and even linking it to the system volume)

You can get it here