A BE36 PLT ALREADY IN POS ON RWY 09L AT ORD AND HOLDING FOR A TKOF CLRNC; OVERHEARS ATC CLR ACFT Y ON A SHORT FINAL; TO LAND ON THE SAME RWY; RESULTING IN THE BE36 EXITING THE RWY.

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I TAXIED TO RWY 09L AT ORD. I HELD SHORT AND THE TWR CTLR WAS HANDLING 3 RWYS; RWY 32L T10; 09L AND 04L. HE CLRED ME INTO POS AND HOLD RWY 09L. I READ THE CLRNC BACK AND TAXIED INTO POS. HE THEN CLRED ACR Z INTO POS AND HOLD AT RWY 09L; PLUS THERE WAS AN ACFT Y ON FINAL FOR RWY 09L. I DID NOT LIKE WHAT I WAS HEARING SO I QUESTIONED THE CTLR AND EXPLAINED I WAS IN POS ON RWY 09L. HE ASKED ME TO CLR THE RWY AND I DID. HE THEN READ ME THE RIOT ACT. I TOLD HIM TO PULL THE TAPES AND ACR Z ALSO AGREED WITH ME THAT THE CTLR HAD CLRED ME INTO POS. THE PROBLEM HERE IS MISCOM BETWEEN ATC AND ACFT; BUT THE PROB LIES IN THE TWR CTLR NOT LISTENING TO WHAT IS BEING READ BACK AND HIM BEING OVERLOADED BECAUSE HE IS HANDLING THREE RWYS AT RUSH HOUR. THE ORD CTLR'S ARE THE BEST IN THE WORLD; BUT I SEE THE ATC SYSTEM OVERLOADING THEM TRYING TO MOVE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE LOCAL CTLR WAS SO BUSY THAT HE BELIEVES THAT HE NEVER TOOK THE TIME TO ENSURE THAT THE READBACKS WERE CORRECT.