Section 10.8 Pedal Point
A pedal point is a note that is held through changing harmonies, starting as a chord tone before becoming a non-chord tone. Pedal points are often in the bass voice (the term “pedal” relates to the foot pedals on an organ 1 ).
Here is an example from the Romantic era.
The Clara Schumann example above also has a suspension (“3-2 sus.”); suspensions are discussed in the next section.
When a pedal point is in the bass, it is not necessary to specify the inversion of the chord because the bass pedal point obscures the inversion.
You might also encounter a pedal point in a higher voice, as well as a “double pedal point,” where two notes (often a fifth apart) act as pedal points.
youtu.be/Mlckvcf69wo?t=9s