In April, we received word that Amazon was working on a high definition music streaming service to rival Tidal’s HiFi subscription offering, and after months of waiting, a contender has finally emerged.

Starting today, Amazon Music HD promises listeners access to more than 50 million 16-bit lossless high definition songs sampling at 44.1kHz, or the sound equivalent to tracks found on CDs. Subscribers will also have access to “millions” more 24-bit Ultra HD songs sampling at 192kHz, which is the highest audio quality available in the music industry.

Current subscribers can upgrade to Amazon Music HD for free for 90 days.

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