Hmmm I might have arranged the cables but I would imagine an experienced studio musician looking at a photo with NO cables would go "where are all the cables? is this some sort of wireless studio from the future?"
It would be like retouching out someone's eyebrows. You wouldn't know what was wrong at first, but something would definitely be missing.
As Hoff stated correctly, a studio without wires just ain't right! And the client wanted the wires as is, to give it more of an actual working environment...believe me, it was discussed before the shoot.
ah well.. 2 against one... cables stay... but why though? Is the shots for him or for potential clients to record in his studio? I mean shooting real estate I am to take away all cables and even electrical outlets, just so that it keeps a minimalistic look and well designed. I even make grass green, paint the walls and clean the pools...