He used his clout as a journalist for a major daily to gain entry to many archival collections not widely available, like the papers of the Esterházy family in the National Library in Budapest. With an encyclopedic mind he marshaled a staggering amount of documentary evidence in his five-volume summa on the life and works of Haydn, the Haydn Chronicle. The culmination of that work, as well as his editing of authoritative scores of the composer's symphonies and his encouragement of many other Haydn scholars, comes in a sense this year with the bicentenary of Haydn's death. To honor his passing, Ionarts will focus for the next few days on reviews of some more Haydn discs that have been piling up on my desk.
Many more people will likely remember Robbins Landon for his later work on Mozart, especially his widely read book 1791: Mozart's Last Year, which stripped away the layers of nonsense about Mozart's death. His writing style, because of his work in newspapers, was much more journalistic than most scholars (if not necessarily all that elegant), meaning that what he wrote reached a far wider audience. For more information on his life, see also the obituary published by The Telegraph.