thanks I will try script with it  
addEventHandler( "onPlayerWasted", getRootElement( ),
	
        function()  wasted (killer, weapon, bodypart) 
	local sound = playSound ("song.mp3", true)
        setSoundVolume(sound, 0.5)
  
end 
addEventHandler( "onClientResourceStart", getResourceRootElement(getThisResource()), ClientStarted )
	Is it correct ? i'm new in scripting