Google has been extremely active over the past few weeks launching update after update. Today, the latest update is for Google+, more specifically Google+ Hangouts On Air. Since its inception, bands have used Google+ Hangouts On Air to "perform live for global audiences, and jam with fans face-to-face."
Right now, Hangouts On Air has pretty bad sound quality that is optimized for speed and voice, not high-quality live music. However, Studio Mode aims to turn the sound feed into a seemingly CD-quality stream that has full stereo and a higher bit-rate. As of right now, the update has only been pushed out to 25% of users.
Google has produced a YouTube video demonstrating the difference between the audio. Take a listen for yourself, using a pair of high quality headphones for the best effect. With the new audio quality, it's hard to go back to the original. But don't take my word for it--watch the video below: