"Sotto voce criticism of the Philadelphia Orchestra’s upcoming tour of Israel began a few weeks ago, but erupted noisily Friday with about four dozen protesters rallying in front of the Kimmel Center as audiences were leaving an orchestra matinee.

Activists urged the orchestra to cancel its concerts in Haifa, Tel Aviv, and Jerusalem, citing Israel’s treatment of Palestinians in general and, in particular, recent actions by Israeli security forces at Gaza border demonstrations that left more than two dozen Palestinians dead and hundreds injured.

'Tune out Apartheid — Don’t Fiddle for Israel,' read one sign. 'Violins — Not Zionist Violence' was another."