 Among most prominent classical musicians in Moldova are Maria Bieșu, one of the leading world's sopranos and the winner of the Japan International Competition; pianist Mark Zeltser, winner of the USSR National Competition, Margueritte Long Competition in Paris and Busoni Competition in Bolzano, Italy.Most retail businesses close on New Year's Day and Independence Day, but remain open on all other holidays.Christmas is celebrated either on 7 January, the traditional date in Old Calendarists Eastern Orthodox Churches, or on 25 December, with both dates being recognized as public holidays.