I think this is a very useful technique to enrich harmonic progression over a pedal point
Another rarity found in this score is the use of a new sound source and sound quality in the 2nd movement: a pedal point
(a minor ninth doubled at the octave) played back from magnetic tape, which plays for the duration of the movement.
Listen for the relationship of a melody to a pedal point
Another tonal feature often used in fugues is the pedal point
. Harrison employs a simple rhythmic equivalent in the middle section of his Fugue, by having the bass drum present an extended drum roll.
Recognizing its twelve-pitch structure, Godsalve also shows how it manages the transition in locale and mood through increasing tension produced both by the reiterated F pedal point
and by the mounting pitches of successive horn fanfares.
Jennifer Paul lavishes on these, and on the whole set, great care and attention, although she cannot always disguise the feebleness of invention (as in La de Boisgelou, with its interminable pedal point
, or in the vapid scales and arpeggios of La Semillante).
The sostenuto pedal gives the pianist an ability to create what's called an organ pedal point
by keeping a specific note's damper or dampers in their open position, allowing those strings to continue to sing while other notes can be played without continuing to resonate.
 In Rands's choral song cycle Canti d'Amor, based on selections from James Joyce's Chamber Music, a pedal point
often serves as the basis for such a continuity.
33: a soft beginning over a pedal point
; a main theme that is built out of legato crotchets that move in and around an arpeggio, thus easily lending itself to transference to other registers; the same material later punctuated by fast-moving figuration in the first violin; a more overtly bravura transition section dominated by the first violin; a second subject that returns to the opening theme now played in free inversion; and, throughout, clearly articulated paragraphs.
Might the sostenuto pedal be employed to play a pedal point
so the left hand does not have to sustain it?