@Pianosuzy When you downgrade from Pandora Premium to Pandora Plus or ad-supported Pandora, you will not be able to access your on-demand music collection or custom playlists.
However, your collection and playback history will be stored in our servers for when you resubscribe to Pandora Premium. In the meantime, you will have access to all the stations you've created and any podcasts you've added to your account including all Thumb feedback and added variety.
Hope this helps!
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