FLT CREW OF B757; DISTRACTED BY RADIO COM PROBS; LANDED ON RWY 35L AT DFW WHEN CLRED TO LAND ON RWY 35C.

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ARRIVING INTO DFW ON A DOWNWIND VECTOR FOR A VISUAL LNDG TO RWY 35C. THE FO WAS FLYING. DFW APCH CLRED US TO 4000 FT TO FLY OVER THE TOP OF AN RJ THAT WAS ON A STRAIGHT IN APCH FOR LNDG ON RWY 35R. AFTER WE PASSED OVER AND VISUALLY SAW THE RJ; APCH CLRED US FOR A VISUAL TO RWY 35C AND TOLD ME TO CONTACT THE TWR ON 126.55. WE BECAME QUITE BUSY WITH FLAPS; GEAR; ETC; AND WHEN I SWITCHED TO TWR I DIALED IN 129.55; THE WRONG FREQ. I HAD TO DIVERT MY ATTN TO THE APCH PLATE TO FIND THE PROPER FREQ. BY THE TIME I LOCATED THE FREQ AND CALLED THE TWR; WE WERE ON ABOUT A 3 MI FINAL. THE FO WAS CALLING FOR THE LNDG CHKLIST AND I WAS BUSY WITH VARIOUS CALLOUTS. THE APCH LOOKED GREAT; HE WAS LINED UP AND IN A PERFECT VISUAL SLOT. WE WERE CLRED TO LAND ON RWY 35C BY A FEMALE CTLR. WE LANDED AND TAXIED TO THE GATE WITHOUT INCIDENT. I WENT INSIDE AND GOT THE OUTBOUND FLT PAPERWORK. WHEN I RETURNED TO THE ACFT THE FLT ATTENDANT HANDED ME A NOTE TO CALL THE FAA. WHEN I INTRODUCED MYSELF THE CTLR SUPVR ADVISED ME THAT WE HAD LANDED ON RWY 35L. I WAS STUNNED AS THE THOUGHT HAD NEVER ENTERED MY MIND. AFTER A BRIEF DISCUSSION I BECAME AWARE THAT HE WAS ABSOLUTELY RIGHT. HE TOLD ME THAT THE CTLR REALIZED OUR MISTAKE ON ABOUT A 1 MI FINAL; BUT DECIDED TO SAY NOTHING. NO ONE WAS USING THE RWY AND IT DID NOT CAUSE ANY CONFLICT OR PROB WHATSOEVER. THE CTLR STATED THAT THE ISSUE WAS CLOSED AND WOULD GO NO FARTHER AS THERE WAS NO INCIDENT OR CONFLICT. I THANKED HIM FOR HIS CONSIDERATION. AFTER 37 YRS; 27000 FLT HRS AND TENS OF THOUSANDS OF APCHS AND LNDGS; I COMMANDED A FLT WHICH LANDED ON THE WRONG RWY. DISTR; THE CLOSENESS OF THE PARALLEL RWYS; MY FO'S ERROR AND MY FAILURE TO MONITOR THE LOC CONTRIBUTED TO THIS INCIDENT.