Ranking The Best Guest Mentors On 'The Voice' Is Hard, But I Managed To Do It

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With more than seven seasons under its belt, NBC's The Voice has had some incredible stars from the music world make their way onto the series to mentor contestants and teach them how to give their best performances on the show, and in the future. We've seen everyone from Aloe Blacc to Lionel Richie to Taylor Swift on the show, but which mentor was the best? It's tough to decide who's better than who, since they're all so good, but let's be honest. Even greatness can be ranked. Let's take a look.

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