I’m running a horror game set during the Spanish Civil War’s Siege of Madrid (Soldiers of Pen & Ink for Trail of Cthulhu if anybody’s interested, it’s excellent!) and there’s lots of situations where there’ll be crowds of people in various states of upset, such as under artillery barrage or aircraft bombing, huddled nervously in underground bunkers, engaging in large-scale combined arms battles, being trapped and attacked, and, for reasons spoilery, being quietly glum and miserable en masse.
Any suggestions on the best soundset or two for crowds when the marketplace goes nasty?