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| Un Ballo in Maschera | 
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| Count Horn | 
| Lyric bass role. Along with Tommaso and Renato he conspires to kill Riccardo/ Gustavus. | 
| Year | 
| San Francisco Opera Horn History | 
| Artist | 
| 1931 | 
| Louis D'Angelo | 
| 1937 | 
| Emanuel List | 
| 1940 | 
| 1942 | 
| 1944 | 
| 1953 | 
| 1957 | 
| 1961 | 
| Plinio Clabassi | 
| 1965 | 
| Joshua Hecht | 
| 1967 | 
| 1971 | 
| Richard Mundt | 
| 1977 | 
| Aldo Bramante | 
| 1982 | 
| Kevin Langan | 
| 1985 | 
| Kevin Langan | 
| 1990 | 
| 1999-2000 | 
| John Ames | 
| Lorenzo Alvary | 
| Ara Berberian | 
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| Lorenzo Alvary | 
| Lorenzo Alvary | 
| Lorenzo Alvary | 
| Lorenzo Alvary | 
| Note: In the Boston version of the Ballo, Count Horn is Sam and Count Ribbing is Tom. | 
| Count Ribbing | 
| Lyric bass role. Along with Samuel and Renato he conspires to kill Riccardo/ Gustavus. | 
| Year | 
| San Francisco Opera Ribbing History | 
| Artist | 
| 1931 | 
| Eugenio Sandrini | 
| 1937 | 
| Norman Cordon | 
| 1940 | 
| 1942 | 
| Douglas Beattie | 
| 1944 | 
| 1953 | 
| Desire Ligeti | 
| 1957 | 
| Nicola Moscona | 
| 1961 | 
| Andrew Foldi | 
| 1965 | 
| John West | 
| 1967 | 
| 1971 | 
| Philip Booth | 
| 1977 | 
| James Courtney | 
| 1982 | 
| Gregory Stapp | 
| 1985 | 
| James Patterson | 
| 1990 | 
| Nikita Storojev | 
| 1999-2000 | 
| Robert Sellon | 
| Charles Goodwin | 
| Federico Davia | 
| Aria Data Base for C.Horn | 
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| Aria Data Base for C. Ribbing | 
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| 2006-2007 | 
| 2006-2007 | 
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