How You Can Win Tickets to the Grammys or See Gwen Stefani in Concert!

It's Grammy week, and pop diva Gwen Stefani is getting ready by teaming with MasterCard to give fans a priceless surprise! MasterCard will tweet clues through Thursday, and if you can decipher the message, you could win a big surprise, like tickets to see the 2015 Grammy Awards or Gwen in concert at L.A.’s famed Orpheum Theater!

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