Pandora removed the ability to move songs from one station to another, which made it fun and easy to create distinct stations. Pandora has a tendency to blur stations together without it, since what you like is what you like, so it's essential for curating stations (which used to be the unique selling point of this app). I've seen clunky workarounds that are only available to Premium users with access to a Thumbs Up Playlist, but there's really no reason this option can't be restored since it was part of the app for years.
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