Mozart, W. A. Concerto for Bassoon in Bb major, first movement. Allard, Maurice. Le Basson: Methode de basson (Paris: Gèrard Billaudot, 1975), p. 28. For the Eb major arpeggio use this for Bb4:

x x x | x o x
   a     E
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Suggested Buffet-system bassoon fingerings for musical passages