(Telecompaper) Amazon has announced the launch of a new high quality tier for its Music subscription service to compete with rival lossless audio streaming players including Tidal, Deezer and Qobuz. The new plan, dubbed Amazon Music HD, lets customers stream more than 50 million songs in High Definition (HD) audio and millions of songs in Ultra HD (UHD), described as the highest quality streaming audio available. HD audio is defined as 16-bit files with sample rates of 44.1kHz and above, while UHD has a depth of 24 bits and a sample rate of 96 kHz to 192 kHz.