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LMAO moriarty is at fangirl level obsession
How did forget about this!
On the tree in front of the Natural History Museum, Sherlock listens to Offenbach's 'Barcarolle' (from 'The Tales of Hoffmann') in his head. Important note that this piece is mentioned in the Canon in The Adventure of the Mazarin Stone!
Extra fun note here that Moriarty then sings it to Sherlock on Tower Bridge! Of course, I have many questions, but it's certainly a neat touch.