 The first volume was released in April 2020.Lecturing on Mahler for many years, Henry-Louis de La Grange toured the United States, Canada, England, Ireland, Sweden, Norway, Belgium, the Netherlands, the Czech Republic, Hungary, Spain, Italy, Morocco and, in the Far East, Japan, Hong Kong, Indonesia, the Philippines, Australia, and New Zealand.He spoke at Stanford University, Columbia University, and Indiana University (1974–81), the University of Geneva (1982), the University of Leipzig, the Juilliard School, the University of California at Los Angeles (1985), Budapest University (1987), the University of Hamburg (1988), the University of Oslo (1993), the Paris Conservatory, as well as the universities in Kyoto, Hong Kong, Wellington, Sydney, Canberra, Melbourne, Boulder, and San Francisco (1998), and taught a DEA seminar at the École Normale Supérieure in Paris (1986).