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Good question! Currently, there's no way to select a language preference on Pandora - same as with the Google Home/Nest device. I suggest you set a specific radio station on routines that only play English songs. We're always looking for ways to improve and we'll take this as feedback and pass it along to the team. I also suggest that you send feedback using your devices by saying, "Hey Google, send feedback" or by following the steps on this link.