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'Duck Dynasty' Star

Rocking Out in Nashville

With Local Band

6/7/2014 6:45 AM PDT BY TMZ STAFF

060714_si_robertson_launch_v2"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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