Xfinity Stream App need Music Choice channels in wide screen.

@XfinityTony​ This isn't about picture resolution being HD or SD but the fact that the Xfinity Stream App isn't showing a wide screen (Full Screen) version of the music choice channels when Google casting to a Chromecast HD with Google TV connected to a wide screen computer monitor from the Xfinity Stream App. It is being cropped to a 4:3 picture on a 16:9 wide screen display but in the 4:3 display the music choice channels are being squished with the picture/programming of a 16:9 picture. Also the Music Choice Android app you mentioned does not allow Google casting. 

Typically, all standard definition (SD) content is 4:3 aspect ratio. So you would receive bars on the side. Depending on the device, it could stretch or zoom on the feed. As the channels are SD, this is how the feeds will be working in the future. If this is an issue, there are a variety of other music applications that can be used and cast to your device. @user-Pa07161