C#5. Cooper, L. Hugh. "Bassoon Clinic Series, Part Four," Etude: the Music Magazine 47/6 (June 1949): 356.

   (Eb)
x o x | x o x
c

C#5. Cooper, L. Hugh. The Double Reed 1/2 (October 1978): 13.

     Eb
 x o x | x o x
d c

C#5. Corey, Gerald. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 65. For slur from C#4 to C#5.

C#4:                    C#5:
              F#            Eb
x x x | o x x F         x o x | x o x

C#5. Groeling, Charles R. "Cultivating Bassoonists." The Instrumentalist 47/1 (August 1992): 52. Hardisty, Donald M. "Tuning those Bassoons: Part II--Tuning Individual Notes and Registers." The Instrumentalist 36/8 (March 1982): 72.

     Eb 
 x o x | x o x
d

C#5. Klimko, Ronald. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 59. Similar to Cooper p. 336 except use F key instead of Ab key.

     Eb
 x o o | x x x F
d

C#5. Ledwith, Austin. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 66.

 x o o | o o o
d

C#5. Moritz, Frederick. "A Dissertation on the Use of Alternate Fingerings for Some of the High Register Notes on the Heckel and Heckel-Type Bassoons." The Double Reed 8/3 (Winter 1985): 28, 34.

     Eb
 x o x | x o x
d        (E)

or:

    Eb
x o x | x o x
 c      (E)

C#5. Porwit, Timothy. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 60. Similar to Cooper p. 331 but add right thumb Bb key and right hand F key.

    Eb
x o x | x o x F
 c     Bb

Heckel-system bassoon fingerings by note name