EXHIBIT 2.1 FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER This FIRST AMENDMENT, dated as of December 1, 2004 (this "Amendment"), to the Agreement and Plan of Merger, dated as of September 11, 2004, among WPP Group plc, an English public limited...Agreement and Plan of Merger • December 2nd, 2004 • Grey Global Group Inc • Services-advertising agencies • Delaware
