content: property my_title : "Group"
  
  tell application "Music"
  	set sel to selection
  
  	repeat with outerTrack in sel
  		tell outerTrack to set {da, tn, dn, a} to {date added, track number, disc number, album}
  		set innerTrack to contents of outerTrack
  		set y to (do shell script "echo " & date string of da & " | grep -o '[0-9]\\{4\\}'")
      set m to ((month of da) as integer)
      set d to day of da
      set di to 10 - dn
      set ti to 100 - tn
  		set g to (y & "." &  m & "." & d & "." & a & "." & di & "." & ti)
  		set comment of innerTrack to g
  	end
  
  end
  