The audience stands and the 'orchestra' (stage) were restored using pentelic marble in the 1950s. Since then it has been one of the main venues of the Athens Festival, which runs from June through September each year, featuring a variety of acclaimed Greek as well as International performances; The Odeon has hosted Maria Kallas, Maurice Bezard, the Bolshoi Ballets, Mikis Theodorakis, Dionysis Savopoulos and many other important artists. It hosted Yanni's Live at the Acropolis performance in September of 1993. Another memorable performance at the Odeon of Herod Atticus was given by the Greek singer Nana Mouskouri in 1984, after 20 years of absence she returned to her country.