Top Secret Drum Corps is a precision drum corps based in Basel, Switzerland. With 25 drummers and colorguard members, the corps became famous for its demanding six-minute routine performed at the Edinburgh Tattoo in 2003. With its invitation to Edinburgh, Top Secret became one of the first non-military, non-British Commonwealth acts to perform on the Esplanade at Edinburgh Castle. Since its success in 2003, Top Secret was invited to return to Edinburgh in 2006 with a new and improved routine. They were invited a third time in 2009 and again in 2012. Under the leadership of Erik Julliard, the band is also responsible for the founding of the Basel Tattoo, a military tattoo show similar to the Edinburgh Military Tattoo, now held annually in Basel.