Why do we copy the accents of people around us?

You've probably noticed something strange about the way you talk. Spend a week with your cousins in Texas, and suddenly you're saying "y'all." Watch British TV for a month, and "brilliant" starts sneaking into your sentences. Your mouth is a copycat, and it's doing this without asking permission.
Your brain treats voices like catchy songs. When you hear someone speak, your brain doesn't just decode the words — it also records HOW they sound. The melody of their sentences. The exact way their tongue hits the roof of their mouth for a "t." All of it gets stored in your audio library, like your brain is building a playlist of every voice you've ever heard.
