What is Amazon Music HD?
Amazon Music HD is a premium quality music subscription service with 75 million songs in High Definition (HD) and in Ultra High Definition (Ultra HD).
Amazon Music HD listeners can stream higher-quality music on their Echo devices, Sonos speakers, Fire TV, iOS, Android, Desktop, and more.
Customers can stream 75 million songs in lossless HD quality and millions of songs in Ultra HD quality across a wide variety of devices. A growing catalog of over a thousand songs mastered in Dolby Atmos and Sony's 360 Reality Audio codecs are available in 3D audio on the Amazon Echo Studio device.
HD audio quality is more than double the quality of standard streaming services. Ultra HD audio quality is up to 10 times the quality of standard streaming services.
For more help, try our Amazon Music forum