Sure, he's been knighted by the Queen of England, and has enough Grammys to use "as doorstops" as The Washington Post put it, but now Paul McCartney has another honor to add to the pile. On Monday, the Library of Congress is to announce that Sir Paul is the third recipient of the 2010 Gershwin Prize for Popular Song, thanks to his "indelible and transformative effect on popular song and music of several different genres." The award commemorates songwriter brothers George and Ira Gershwin, whose manuscripts are curated by the Library of Congress. McCartney is the third songwriter to win the prize, after Paul Simon's win in 2007 and Stevie Wonder's win in 2009. After winning, Simon donated the original manuscript of "Graceland" to the library, while Stevie Wonder was commissioned to write "Sketches of a Life," although there is no word yet on what McCartney might do.