John Lennon's relationship with Yoko Ono may have signaled the beginning of the end for the Beatles, but thankfully it didn't put our bespectacled hero out of the limelight. The couple advocated for world peace, stayed in bed all day, and even made some music together -- most notably Double Fantasy, their 1980 collaborative project. As Lennon's recorded output goes, Double Fantasy is pretty lame. Who wants to hear one of the most revolutionary voices in 20th-century popular music sing tenderly about marital bliss and embracing middle age? But in this case, history has eclipsed the music -- the album is worth talking about because it represents the last time Lennon recorded before his assassination (which happened three weeks after Double Fantasy came out). On Tuesday, December 7 -- the 30th anniversary of Lennon's death -- Ken Sharp and Boston-based photographer Roger Farrington will be signing copies of their new book, Starting Over: The Making of John Lennon and Yoko Ono's Double Fantasy, from 6-8 pm at Panopticon Gallery. Sharp was the first photographer allowed access to the recording sessions for Double Fantasy, and his previously unseen photographs of John and Yoko making music together for the last time will be on display at the gallery through January 4. All musical merit aside, this is a great opportunity to experience one of our favorite modern pastimes: reveling in juicy pre-death gossip.