High Definition (HD) tracks will be more than double the standard streaming bitrates (up to 850 kbps), so the sound will be about that of a CD. Like most music streaming services, Amazon Music's current standard quality (up to 320 kilobits per second) is considered good for MP3, but not as high as compact disc-quality. The online retailing giant (and content provider) is flipping the switch on Amazon Music HD, which adds more than 50 million songs in CD-quality sound and millions in better-than-CD Ultra High Definition quality. Ever wondered whether your ears deserved to hear music streamed in higher resolution? Amazon wants you to give it a try.
