It's called "Welcome to the Show" and it's performed by Cody Johnson who grew up in the Huntsville area. Johnson made his Rodeo debut in 2017 and performed again when Old Dominion had to drop out.
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The song will greet fans every night of the rodeo. You can even hear Johnson play it live when he takes the stage on March 15.
See the full 2019 RodeoHouston lineup here.