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You can save individual tracks on Spotify and Tidal
Hmmm maybe it’s a country specific feature. I‘ve tried again just now on Spotify and it’s not possible. You can “hide” the unwanted tracks on an album but it takes ages and this doesn’t sync across devices on the same account.
 
Still no HomePod support... ffs.

Another "tech" company that doesn't actually invest in their product, see Amazon as well.
 
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