Sync Apple Music to iPod classic

See Sync your iPhone, iPad, or iPod using your computer - Apple Support. Make sure that you only select locally stored media purchased from the iTunes Store, ripped from CD, or downloads from other sources. DRM laden content from the Apple Music subscription service cannot be synced to iPod Classic.

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If you mean subscription content from the Apple Music service, you can't. Apple Music is not supported on older hardware.

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How do you put music onto it then?