The Zuma concept is not new. Popcap borrowed it from Mitchell Corp.'s 1998 arcade game Puzz Loop/Ballistic. In 2004, President Roy Ozaki intended to file a lawsuit against Popcap for IP infringement. The outcome is not known. Mitchell did however rework the game concept in the 2006 Nintendo DS game Magnetica.
If you scroll over the Main Menu selections from top to bottom, the notes played are the same 5-note motif from "Close Encounters of the Third Kind"