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In 2007–2009, Widjaja played on a more than 150 year old violin by Nicolas Darche, which was given to him on loan as a multiple prize winner of the Competition of the German Musical Instrument Fund.[6]
He currently[when?] plays a violin by JB Vuillaume, 1875, as well as the Stradivarius "Stephens" 1690, on loan from Florian Leonhardt.[citation needed]
At the same time, he frequently performs at mass media events such as Miss World or Miss Earth, the Davis Cup, the EXPO in Milan, Fashion Week in Paris or for the world premiere of the Suite for Violin and Orchestra "Across the Stars" from Star Wars by John Williams at the Wiener Konzerthaus.[7]
Iskandar is heavily involved in educational projects for children in the Asia-Pacific region, in collaboration with UNICEF[8] and the WWF (World Wrestling Federation). With KOMPAS Gramedia, Indonesia's largest media group, he organised charities to fund musical instruments and lessons for street children.
2004: First prize at the national Jugend musiziert competition in the violin solo category and 2nd prize at the Queen Sophie Charlotte international competition.
2006: Third Prize at the Violin Competition of the Ibolyka Gyarfas Foundation.
2008: First prize at the International Hindemith Competition and award of the Paul Hindemith Gold Medal and the Maggini Foundation Prize