On Saturday night, country music icon Willie Nelson headlined a free concert in Austin for Texas Senate candidate Beto O’Rourke.

With his legendary guitar Trigger in hand, signature red bandanna and T-shirt emblazoned with ‘Beto for Senate’ , Nelson encouraged the crowd to join in and sing along with his new song “Vote ‘Em Out.”

Before he started the politically-driven song, which is a call to action against candidates voters dislike, Nelson said “Here’s a new song we’re going to spring on y’all tonight. Take it home with you, spread it around,”

“If you don’t like who’s in there, vote ’em out / that’s what Election Day is all about / and the biggest gun we got / is called the ballot box / if you don’t like who’s in there / vote ’em out.”

Beto O’Rourke is the Democratic candidate hoping to unseat Ted Cruz from his senate seat.