Music played

Exploration Stage: Summer Theater Stage
From: Martha
Description: I heard it was Jacob who first told you about the shadow city. I first met him in...well, a club. There was music playing that I had never heard before, and I couldn't quite make out the whispers of the spirits. Can you confirm where this music is coming from?
Completed: The spirit told me that this machine has a hidden secret. This thing doesn't just play sounds, it can record them too. I hear someone speaking... the words "secret alliance.