I was heartbroken when I learned about the deaths out in Oakland 
at a Rave.  Although most people I've spoken to think of raves as embracing drugs and debauchery, I cannot say enough in the other direction.  Raves were instrumental in getting me out into the world, in getting active (this is "dance" music), and finding an identity and a real love of a form of music that's huge outside of the US.
I've both lived through a house fire and spent a fair amount of time in old warehouses that were undoubtedly not up to code.  This pain feels especially close.  My thoughts go out to the victims and their families.