pedal note
noun
Music 【乐】
1
- the lowest or fundamental note of a harmonic series in some brass and wind instruments（铜管乐器的）基音, 泛音列的第一音。
2
- （亦作pedal point）a note sustained in one part (usually the bass) through successive harmonies, some of which are independent of it持续和谐（低）音。