Heinz Holliger is widely considered the greatest oboe virtuoso of modern times. He is also a noted composer and conductor; as a composer, he is one of the few who has maintained a strict adherence to serial procedures. With a deep understanding of the performance practices of all eras of music, Holliger has garnered praise for his mastery of the many extended techniques related to the performance of 20th century music. He is credited with having extended the technical range of the instrument more than any other oboist. Some of these extended techniques include harmonics, double trills, multiphonics, and glissandos. In 2022, Holliger conducted the Philharmonia Zürich and a cast led by Christian Gerhaher in a recording of his second opera, Lunea.