The Choir quest can only be completed after you escape prison in Valor Mortis. You start the quest by reading the crazy Prison Warden notes on how he wants to create the greatest symphony for the Emperor. You need to go around the prison to find some of the notes and unlock the chapel. So, it's best to get your weapons first and take care of the Eternal Guards to explore more leisurely.
Discover the Finders Keepers quest Silver Cache location in The Blood of Dawnwalker.
From the cell you woke up in, climb the stairs and go behind a destroyed wall to crawl into the safe passageway.
Get out of the other side and turn left to enter a room.
Ignore the door that Mice did or didn't open for you and use the other door to the left.
Make sure the guard is not patrolling and go inside the office to find the first note from the Prison Warden.
This triggers The Choir quest in Valor Mortis. I recommend locating the Armoury Key and getting back your gear to fight all the guards, as it will allow you to move around more freely.
From the room you found the Armoury Key, turn left, then head to the cell on the right.
There is another paper here that reveals more about the madness of this symphony.
Next, head to the corridor where there's a red glowing bulb and a patrolling guard.
Shoot the bulb and crawl through the gap on the right side.
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