** FILE ** Singer Bob Dylan is seen in this April 27, 1965 file photo in London. Thanks to Bob Dylan, rock 'n' roll has finally broken through the Pulitzer wall. Dylan, the most acclaimed and influential songwriter of the past half century, who more than anyone brought rock from the streets to the lecture hall, received an honorary Pulitzer Prize on Monday April 7, 2008, cited for his "profound impact on popular music and American culture, marked by lyrical compositions of extraordinary poetic power." (AP Photo/File)