Nilüfer Yanya has one of “those” voices. You know, the ones where you listen to her sing and it dawns on you, “Ah yes, I am not a professional singer and cannot do that or anything close to it.”

The British singer-songwriter and guitarist played an earlybird set at Austin City Limits Music Festival on Saturday. Those lucky enough to have made it out right after the gates opened gathered to hear a mellow, vibey set flavored with jazz flourishes. (Gotta bring a saxophone on the Lord’s day.)

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But: the voice. A few ways you might describe Yanya’s pipes:

• Wind blowing through the hull of a wooden ship recently raised from the briny depths

• Stirring sugar in a double boiler and burning just enough on the bottom so that it still smells good

• The act that probably followed the “Diva Dance” singer in “The Fifth Element”

• Annie Lennox if she was raised in a lab by Andy Williams and Norah Jones (the science to make this happen does not let exist)

• The aural equivalent of boozy hot chocolate going down your throat

Yanya’s guitar chops were nothing to sneeze at, either; she plucked out elastic notes throughout the set. Her standout songs, “Baby Luv” (a tense rubberband of a tune) and “In Your Head” (which makes you feel like you’re in a teen soap opera in the best way) came late in the set. But the slow burn was worth the wait for a gem like Yanya.