NEW : McCartney awarded Library of Congress Paul McCartney for Popular Song . NEW : Englishman , Stevie Wonder , others perform famous songs in the Gulf of Mexico . NEW : McCartney performs love ballad `` Michelle '' and quips he may get punched out by president . NEW : Obama calls McCartney most successful songwriter in history .
NEW : Paul McCartney awarded Library of Congress Gershwin Prize for Popular Song . NEW : McCartney , Stevie Wonder , others perform famous songs in East Room . NEW : McCartney performs love ballad `` Michelle '' and quips he may get punched out by president . NEW : Obama calls McCartney most successful songwriter in history .