According to an article in The Guardian
, The Magician's Private Library
got its unusual title from Holly Miranda's schizophrenic uncle. The two of them were listening to Pink Floyd's Dark Side of the Moon
on a boat one day and when it got to the part on Brain Damage
where the man starts laughing, Holly's uncle, who had been in a mental asylum since he was 23, turned to her and said, "I think it sounds like the magician's private library!"