"Duck Dynasty" star Si Robertson got real country Friday in Tennessee ... no, he didn't hook up with a family member -- the reality star rocked his ass off.
Robertson linked up with The Mauldin Brothers at Rippy's in Nashville to perform a few songs ... and for some reason Si brought a blinged out microphone along for the ride.
The 66-year old attempted to hit some difficult notes while he sang to a surprisingly packed audience.
Try, yes ... succeed, definitely not.
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