Things that like to go boom

I can't get spontaneous combustion out of my head. Those black and white photos of people, lying in fireplaces, boots, devoid of humans, small piles of ashes. What happened, wha happen? That instantaneous and unexplained transformation from bellied, flesh wielding humanoid to flaming HOT HOT piles. I think there's some beautiful simplicity in there, what was happening in the lives of those people before they seemingly blew up in their living rooms? Did they manage to feed the cat? Did they pay their gas bills? What caused the heat? Wha? Wha? Wha happen? And more importantly, as someone writing a backing track to accompany the subject, what would it sound like. All I can say is that I'm trying to secure the services of a flute and a banjo to convey the sonic impression. Good luck all.