A few years ago I went to Aya Sofya with a Turkish violinist friend who studiest at a conservatory here. Unexpectedly, up on the top floor, he pulled out his violin and started playing an Armenian/Azeri song called "Laz".
He made it through 3 glorious minutes before security escorted him out. The sound was unreal.
I would love to hear the same test done in the Basilica Cistern.