In fact , if there is a keynote to the entire Lincoln Center film series , it is that Wagner , in every generation , inspires stirring acts of advocacy , like Daniel Barenboim 's earnest dialogue with Wagner enemies in Israel -LRB- April 22 -RRB- or the inflamed Wagner styles of Wilhelm Furtwangler and Arturo Toscanini -LRB- May 9 -RRB- .