so, i’ve found that tidal also has dolby atmos, but, like apple, it only tells you through a logo in the app. nowhere does it say it on the website. luckily, the ones on tidal have different barcodes and isrc codes, so they’re easier to spot. i had been wondering why tidal always offers a release with a different isrc, and this is why 
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the difference is that dolby atmos is owned by one company. cd digital audio is not, as far as i know.
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Started an official style discussion at Apple Music Dolby Atmos style [STYLE-2348]