content: property my_title : "Timestamp"
  
  on timestamp(datetime)
  	set command to "date -j -f '%A, %B %e, %Y at %H:%M:%S' '" & datetime & "'"
  	set command to command & " +%s"
  	return do shell script command
  end timestamp
  
  tell application "Music"
  	set sel to selection
  
  	repeat with outerTrack in sel
  		tell outerTrack to set {da} to {date added, track number, disc number, album}
  		set innerTrack to contents of outerTrack
  		set comment of the innerTrack to my timestamp(da)
  	end repeat
  
  end tell
  