Until now, I thought that accidentals apply to all notes of the same octave and the same clef during a measure.
However, I'm currently learning the following piece and it seems to be different (4/4 measure signature):
There are two voices in the treble clef. Is the 4th note in the clef a B♭3 or an A3?
Based on the respective recording, I think it is a B♭3.
Is this the usual way of notation, or is it more common to apply accidentals to all voices?
If it is a B♭3:
The B♭3 from the beginning takes 3/4 of the measure, while the second B♭3 is at 4/8.
How is it meant to be played then? Hold the second B♭3 longer till 3/4 of the measure?