Whether it's the TV commercial showing off the latest sports car or the movie trailer that's making you well up in tears, music adds that extra something to make it more special. Though it was once considered "selling out," artists have been allowing brands and non-musical figures to use their music with increasing frequency over the years. But musicians also have their limits on who they'll give the green light to when it comes to using their tunes. Politicians often incorporate well-known songs into their campaign -- sometimes without the musicians' permissions. And sometimes, artists like Adele and Dave Grohl don't want a particular individual to use their songs because their political philosophies don't align. So what happens then? They just say no! Here's 21 artists who have banned politicians from using their music.

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