Here you go: 
            GUIEditor = { 
            button = {}, 
            window = {} 
        } 
          
      
                GUIEditor.window[1] = guiCreateWindow(495, 299, 522, 358, "Songs panel", false) 
                guiWindowSetSizable(GUIEditor.window[1], false) 
          
                GUIEditor.button[1] = guiCreateButton(12, 38, 198, 69, "SONG1", false, GUIEditor.window[1]) 
                guiSetFont(GUIEditor.button[1], "clear-normal") 
                guiSetProperty(GUIEditor.button[1], "NormalTextColour", "FFF90522") 
          
                GUIEditor.button[2] = guiCreateButton(278, 9, 201, 27, "", false, GUIEditor.button[1]) 
                guiSetProperty(GUIEditor.button[2], "NormalTextColour", "FFAAAAAA") 
                GUIEditor.button[3] = guiCreateButton(3, 126, 162, 16, "", false, GUIEditor.button[1]) 
                guiSetProperty(GUIEditor.button[3], "NormalTextColour", "FFAAAAAA") 
          
                GUIEditor.button[4] = guiCreateButton(330, 42, 176, 65, "SONG2", false, GUIEditor.window[1]) 
                guiSetProperty(GUIEditor.button[4], "NormalTextColour", "FF1FF409") 
                GUIEditor.button[5] = guiCreateButton(18, 156, 192, 71, "SONG3", false, GUIEditor.window[1]) 
                guiSetProperty(GUIEditor.button[5], "NormalTextColour", "FF0622F6") 
                GUIEditor.button[6] = guiCreateButton(334, 160, 172, 67, "SONG4", false, GUIEditor.window[1]) 
                guiSetProperty(GUIEditor.button[6], "NormalTextColour", "FFF803EF") 
                GUIEditor.button[7] = guiCreateButton(23, 290, 197, 58, "Stop", false, GUIEditor.window[1]) 
                guiSetFont(GUIEditor.button[7], "sa-header") 
                guiSetProperty(GUIEditor.button[7], "NormalTextColour", "FFAAAAAA") 
                GUIEditor.button[8] = guiCreateButton(338, 286, 168, 62, "Close", false, GUIEditor.window[1]) 
                guiSetFont(GUIEditor.button[8], "sa-header") 
                guiSetProperty(GUIEditor.button[8], "NormalTextColour", "FFAAAAAA")     
          
         function songo() 
          
          guiSetVisible ( GUIEditor.window[1], true ) 
          end 
          bindKey("F7","down",songo) 
          
      
    function Close() 
            guiSetVisible(GUIEditor.window[1], false) 
    end 
    addEventHandler("onClientGUIClick", GUIEditor.button[8],Close, false) 
      
          
    addEventHandler("onClientGUIClick", root, 
            function () 
                if ( source == GUIEditor.button[1] ) then 
                    if isElement(sound3) then destroyElement(sound3) end 
                    if isElement(sound2) then destroyElement(sound2) end 
                    if isElement(sound4) then destroyElement(sound4) end 
                    if isElement(sound1) then destroyElement(sound1) end 
                    sound1 = playSound( "song1.mp3", false ) 
                elseif ( source == GUIEditor.button[4] ) then 
                    if isElement(sound3) then destroyElement(sound3) end 
                    if isElement(sound1) then destroyElement(sound1) end 
                    if isElement(sound4) then destroyElement(sound4) end 
                    if isElement(sound2) then destroyElement(sound2) end 
                    sound2 = playSound( "song2.mp3", false ) 
                elseif ( source == GUIEditor.button[5] ) then 
                    if isElement(sound1) then destroyElement(sound1) end 
                    if isElement(sound2) then destroyElement(sound2) end 
                    if isElement(sound4) then destroyElement(sound4) end 
                    if isElement(sound3) then destroyElement(sound3) end 
                    sound3 = playSound( "song3.mp3", false ) 
                elseif ( source == GUIEditor.button[6] ) then 
                    if isElement(sound1) then destroyElement(sound1) end 
                    if isElement(sound2) then destroyElement(sound2) end 
                    if isElement(sound3) then destroyElement(sound3) end 
                    if isElement(sound4) then destroyElement(sound4) end 
                    sound4 = playSound( "song4.mp3", false ) 
                elseif ( source ==  GUIEditor.button[7] ) then 
                    if isElement(sound1) then destroyElement(sound1) end 
                    if isElement(sound2) then destroyElement(sound2) end 
                    if isElement(sound3) then destroyElement(sound3) end 
                    if isElement(sound4) then destroyElement(sound4) end 
                end 
            end 
        )