TUNES based on Indian classical music will be the flavour of the Beating Retreat ceremony which will also include the country’s “biggest drone show” comprising 3,500 indigenous drones, officials said on Saturday. For the first time, a 3-D anamorphic projection will be done on the facade of North Block and South Block during the grand event at Vijay Chowk on Sunday, the Defence Ministry said in a statement. The Beating Retreat ceremony marks the formal end of Republic Day celebrations. The ceremony will be graced by President Draupadi Murmu. The President is the Supreme Commander of Armed Forces.