Flash mob in the Copenhagen Metro. Copenhagen Phil playing Peer Gynt. 

In April 2012 Copenhagen Phil (Sjællands Symfoniorkester) surprised the passengers in the Copenhagen Metro by playing Griegs Peer Gynt. The flash mob was created in collaboration with Radio Klassisk radioklassisk.dk/. All music was performed and recorded in the metro.
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Produced by makropol.dk/
The sound: The Copenhagen Metro is very quiet and the recording you hear is where the train is standing still. That's why the recording you hear is so clean and crisp - and the sound is actually surprisingly good in the Copenhagen metro. We did this deliberately because we feel that a good sound experience is vital when trying to portray the actual experience that day. Further to the main recording, when the train was standing still, the recordings from the cameras was, as far as possible, mixed into the sound.
Quote from the sound technician: I recorded the sound with XY Oktava MK-012 supercardioid microphones close to the soloists and a set of DPA 4060 omnidirectional microphones as overhead for the rest of the orchestra. For some of the closeupshots, the cameramikes (Sennheiser ME 66) was added.