I found this theme quoted a lot in the first movement a microtonal symphonic work a friend introduced to me: 3. Symphonie in Yes-Dur. Die Unspielbare (I forgot the name of the Austrian composer) - there is no official recording of it yet, just the preview CD.
I'm not sure if rhythm and pitch are correct but the relative steps are. And it's only the first part of the theme. I tried searching with musipedia.org but found nothing.
I uploaded a MP3 version of it at vocaroo.com (which provides anonymous uploads).