Sorry, I dont remember which book in the series it is mentioned as its been too long. I only remember that at one point, to make a counter move in an on going plot, Artemis closes himself in a room and makes lot of arrangements with butler's help to let his brain function at maximum and one of the things he does is listen to a music record. It was either Mozart or Beethoven. I just want to know the exact song.

I remember that at one point, to make a counter-move in an ongoing plot, Artemis closes himself in a room and makes lot of arrangements with Butler's help to let his brain function at maximum.

One of the things he does is listen to a music record. It was either Mozart or Beethoven. I wanted to know the exact song.