pedal note
Concise Oxford English Dictionary © 2008 Oxford University Press:
pedal note
▶noun Music
- 1 the lowest or fundamental note of a harmonic series in some brass and wind instruments.
- 2 (also pedal point) a note sustained in one part (usually the bass) through successive harmonies, some of which are independent of it.
'pedal note' also found in these Oxford entries:

