Concert pianist Jayson Gillham has denied he deliberately misled the Melbourne Symphony Orchestra (MSO) about performing a piece dedicated to journalists killed in Gaza.It has been almost two years since Gillham played Witness, by composer Connor D'Netto, at an MSO concert He introduced it onstage with comments about Israel killing journalists.The pianist is suing the orchestra in the Federal Court for discrimination based on his political beliefs in a case that will test the limits of free speech in Australian workplaces.Giving evidence on the opening day of a 15-day trial, the pianist agreed he had not told the orchestra or his agent about his intentions to play the piece."I worried the MSO would not allow the performance, they would find an excuse," he said.Gillham introduced the composition by saying Israel targeted journalists in an effort to prevent the documentation and broadcasting of war crimes.It prompted the orchestra to cancel another performance at the Melbourne Town Hall, citing safety concerns.Earlier today, the orchestra argued Gillham would have anticipated people would be upset by his comments, with management responding to the incident within minutes.The organisation had no warning about Gillham's onstage comments and felt misled by him, MSO barrister Justin Bourke, KC, told the court in his opening address."He knew he was overstepping the line