Courtesy of Rabbi Steven Langnas.
This is a nice rendition of the special elaborate melody on shabbat morning when there is a זולת. Sung by Sacha van Rawenswade of Amsterdam.
This brings up one of the more "insider" elements of nusach ashkenaz - the piyutim for special shabatot and the musical cues and other additions that let the kahal know its a special shabbat. Thank you Rabbi Langnas!