Folder action to add song to playlist

property myPlaylist : "xyz"
on adding folder items to my_folder after receiving the_files
	repeat with i from 1 to number of items in the_files
		tell application "iTunes"
				set this_file to (item i of the_files)
				set this_file to last track of playlist myPlaylist
	end try
		end tell
	end repeat
end adding folder items to

I have attached this script as folder action to the folder “xyz”. I want to add (when new files are added) the files of folder “xyz” to my playlist “xyz”. Can someone help me?