Possible Clues:

• 1964 #1 hit
• 1973 album featuring 'Photograph'
• Rock star whose name is spelled out by the middle letters of 16-, 18-, 39-, 61- and 64-Across
• Leader of the All-Starr Band
• Starr drummer
• 1973 solo album by an ex-Beatle
• Beatle in the back
• Fab Four first name
• 'You're Sixteen' singer
• Member of the Fab Four