The Killers and Imagine Dragons are headlining a benefit concert next month to help the victims of the October 1 Massacre in Las Vegas. Organizers on Tuesday announced some of the performers of the Dec. 1st concert. Also scheduled to participate are Boyz II Men, magician David Copperfield, magic duo Penn and Teller, and Cirque du Soleil performers. Tickets go on sale Wednesday. Prices range from $75 – $125. Proceeds will benefit the Las Vegas Victims Fund.