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"That's new." John was pointing to Sherlock's headphone. "Since when are you listening to music with your phone, is this something you began when you were dea-... traveling?" He chuckles, trying to hide his emotions "What about listening to the streets! The people! The noises of London!"
Sherlock freezes, unable to replies honesty without saying everything. What could I say... That sometimes the noises are too much; That sometimes the construction's noises are too similar to the sound of a pipe banging on the bars of a prison cell announcing the arrival of my torturers; That the sound of the heavy rain reminded me of being waterboarded... When I am talking to someone it's bearable, but alone... it's... it's just too much to bear.
Removing the headphone, now that John was there, he smiles. "It's not music John, don't be fanciful, I'm learning Swahili."