Only two of the Beatles’ pop contemporaries are depicted on the cover of Sgt. Pepper’s Lonely Hearts Club Band. One is Bob Dylan. The other is Dion DiMucci. In a pleasing third-act twist, Dylan contributes the liner notes to Dion’s new album Blues With Friends — an act of deference that the recipient is still processing. ‘I asked him, I didn’t know if he had the time, but he sent me back those paragraphs and said that I knew how to write a song.’ He whistles. ‘That’s from a Nobel Prize winner. I thought, I’ll take it, I’ll take it!’ So he should. Dion — like Kylie, a single moniker suffices — is one of the last living links to the early days of street-corner rock ’n’ roll. A rough-around-the-edges Italian--American from the Bronx, he headed the first wave of smart-assed tough--talking urban singers.