Scope and Contents From the Series: As one of the most extensive portions of the collection, the programs have been arranged chronologically according to Abravanel's regular engagements with the Utah Symphony, from 1936 until his retirement as musical director in 1979. Box 47 contains programs from concerts with Abravanel as a guest conductor, which have been arranged alphabetically by theater or function. There are also several alphabetized miscellaneous programs.