Protecting music and tunes as a trademark is increasingly popular, especially large companies like McDonald’s to BMW that have a distinctive tune are registering these kind of non traditional trademarks.
As the OHIM is accepting mp3’s as reproduction of the trademark, filing sound marks has become easier and more transparent. Till that moment sound marks were only recognizable for people who understand music notes.
The latest in the series of European sound marks is the theme song of 20th Century Fox. Just play directly in the trademark registration, or see (and hear) this famous tune: