Who should sing at Cubs games?

In the smartest move they're made in a century, the Cubs have announced plans to overhaul the 7th-inning stretch routine, complete with bringing in people who actually know about the Cubs to sing "Take Me Out to the Ballgame." This is the kind of stuff we expected from the Theo Epstein era, and we're excited to offer some suggestions for who (and who not) to target.
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