The legendary singer-songwriter -- who's one of the few Black artists who's broken through into country successfully -- was at LAX Wednesday when a photog asked him about Beyoncé's latest offering, "Texas Hold 'Em."

Darius is fairly brief and succinct in his review -- but he's clear ... he's digging Bey's twang.

He says 'THE' is a great song and even throws good luck her way over the prospect of Beyoncé's foray into country music finally earns her a Grammy award for Album of The Year ... something that's still missing from Bey's mantle.

Remember ... Jay-Z made a big stink about Beyoncé's lack of an AOTY award during a speech at this month's Grammys, so lots of folks are wondering if a country album will get Bey over the hump ... Darius included.

Of course, Beyoncé's going to have to beat out Taylor Swift -- and others -- to win AOTY ... Taylor's got a new album coming out too, and Darius actually addresses Taylor too here.

The cameraman asks Darius if he thinks Taylor should go back to country -- something that another bystander next to DR actually weighs in on before has a chance to. As for Darius, he says Tay Tay should crank out whatever type of music she wants ... ditto for Beyoncé.

One last thing Darius addressed here about Bey and country ... namely, John Schneider's ugly remarks about her last week -- when he likened her to a dog marking its territory.

Like many people ... he agrees that John's words were laced with a racist undertone -- and he says gatekeeping country music is absolutely silly. On the question of whether Beyoncé is a "lightning rod" ... Darius scoffs at that notion as well in this interview.

Long story short ... Darius is all for Beyoncé getting into country music -- he's definitely a fan.