Musical Echoes

While still thinking about that stone quarry cave complex where that fleet of dream cars is parked, there was another piece of graffiti there dating from the 1914 to 1918 conflict, carved to immortalize the 262nd musical group... I wonder if the band played in the quarry halls, and if so, how the acoustics were? And whether the skeleton crew mentioned below can hear the echoes all these years later...
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