As leading artists and executives in the music industry, we are adding our voices to the chorus of Americans demanding change. Music always has been celebrated communally, on dancefloors and at concert halls. But this life-affirming ritual, like so many other daily experiences—going to school or church or work—now is threatened, because of gun violence in this country. The one thing that connects the recent tragedies in Orlando is that it is far too easy for dangerous people to get their hands on guns. We call on Congress to do more to prevent the gun violence that kills more than...