The electronic dance music scene in Arizona is mourning after an attack on Sunday after an east-facing desert party Phoenix caused the death of one co-promoters, and seriously injured another. Witnesses have told Phoenix New Times the shooting was reported to have occurred around 9.40 a.m. the following Sunday, following the closing at Program Your Reality, an non-licensed dance party all night that was held on the south desert side along U.S. Highway 60 outside of Superior…