If the high-pitched part of the piano is extremely complicated, but the left-hand span is large, it is necessary to play the bass (control the harmony rhythm) and extend the bass, so that the pianist can't take care of both sides (because there is no third hand). At this time, the advantage of the left pedal is extremely obvious.
Its function is to play out here. The pianist steps on this pedal and then plays the bass, which will last (unlike the right pedal, it will lengthen the sound of the whole piano at that time). Then, with the support of this bass, he can easily play high-pitched tunes.
Extended data
Sustaining pedal is a kind of pedal that liberates the left hand and purposefully reduces the difficulty of playing. In most upright piano, the middle pedal is a practice pedal. It is of no practical significance to lower a felt between the hammer and the strings to eliminate the loud volume of the piano.
Pedal stepping exercise can take the forms of "slow stepping and slow lifting", "fast stepping and quick lifting", "light stepping and quick lifting" and "light stepping and slow lifting" to exercise the flexible and agile change control ability of ankles. Pedal pedaling exercises can also be combined with the connection of playing scales or positive triads on the hands. At this time, you can practice with "direct pedal" and "rear pedal" respectively.