B flat note, C note, D note, E flat note, F note, G note, A note, B flat note.
The mediant of B flat major is D.
The B-flat major scale contains two flats: B-flat and E-flat. However, if you're looking for a scale that has only one B-flat, it would be the G minor scale, which is the relative minor of B-flat major. In G minor, the B-flat appears as the sixth scale degree, while the scale itself includes B-flat as part of its harmonic and melodic variations.
F Major
the scale e flat major has a flat, b flat and e flat.
None. The F major scale has a B flat.
The subdominant in a scale is the 4th, which in the key of B-flat major is E-flat.
The mediant of B flat major is D.
B-flat
Eb Major
The B-flat major scale contains two flats: B-flat and E-flat. However, if you're looking for a scale that has only one B-flat, it would be the G minor scale, which is the relative minor of B-flat major. In G minor, the B-flat appears as the sixth scale degree, while the scale itself includes B-flat as part of its harmonic and melodic variations.
A-flat Major scale
Your question doesn't make much sense. But for any scale, "do" would be the first note of the scale, which is whatever the scale is called. But for a flat major, from what it sounds like you're asking, the note would be a flat. Ex: In B flat major, "Do" is b flat.
The mediant is the 3rd of the scale, so in B-flat it's D.
b flat, c, d, e flat, f, g, a, b flat
B flat C D E flat F G A B flat
F Major
Eb Major