Mozart, W. A. Bassoon Concerto. Karr, Matt. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 67. For opening Bb3:

    Db
x x x | x x o 
 a c#  Bb
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Suggested Heckel bassoon fingerings for musical passages