John Lennon's guitar
From Tardis Wiki, the free Doctor Who reference
John Lennon's guitar was a guitar in EMI Recording Studios in 1963 that was owned by John Lennon. It featured Gibson branding.
Lennon used it to record the song "I've Got a Dog". Later, the Fifteenth Doctor attempted to use it to find the notes of banishment that would make up the Lost Chord, but was unable to tune it in time before Maestro dragged Ruby Sunday away. Lennon used the guitar again to play "Twist at the End" once Maestro had been defeated. (TV: The Devil's Chord [+]Loading...["The Devil's Chord (TV story)"])