Original: He made his début at La Scala in his hometown of Milan in 1960 and served as its music director from 1968 to 1986 , conducting not only the traditional Italian repertoire but also presenting a contemporary opera each year , as well as a concert series devoted to the works of Alban Berg and Modest Mussorgsky .
Simplified: He was music director for the Vienna State Opera from 1986 to 1991 , where he conducted traditional operas as well as new , 20th-century operas .