The Main Hall (Grote Zaal) of the Concertgebouw is generally considered to be one of the three best halls in the world for symphonic music, the other two being the Grosser Musikvereinsaal in Vienna and Boston Symphony Hall. For the late Romantic repertoire it is in a class of its own. The hall went through major renovations between 1986 and 2002, in respect of which eventually all wall and ceiling surfaces as well as the seating and stage were renewed. These operations were all carried out with greatest care to preserve the acoustic of the hall. All details, including the quality of paint and plaster and the sound absorbing properties of new wooden floors and chairs, were carefully checked in the Peutz laboratories.