The new track sounds like an anthem for the Red and Gold - It's called "Niner Gang."
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The team even tweeted a link to the song and said, "New slap for your tailgate today," ahead of the Monday night game against Seattle.
E40's loyalty to Bay Area sports teams is well documented.
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His song "Choices (Yup)" blew up as a fan favorite when it was remixed to sound like a theme song for the Golden State Warriors.