Machine Gun Kelly is a well-known figure in American music. Here's why he's lending his vocal chops to the NFL for its duel between the Giants and the Panthers on Sunday.
Taking the stage at halftime in Munich: <a href="https://twitter.com/machinegunkelly?ref_src=twsrc%5Etfw">@machinegunkelly</a>! <a href="https://t.co/v3hCcABtYm">pic ...
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