F 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.
Ab Major
F major
The mediant of B flat major is D.
None. The F major scale has a B flat.
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.
The key signature with one flat is either F major or D minor.
A-flat Major scale
The subdominant in a scale is the 4th, which in the key of B-flat major is E-flat.
C flat Major
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.
e-flat major
The Keys of B-flat, E-Flat, A-Flat, D-Flat, G-Flat, C-Flat, and F-Flat major all contain the note E-flat. F-flat major is a key which only exists in theory and not in practice, since there is a double flat in that scale (subdominant). The major scale with the most flats is C-flat major - with all seven flats.
The major scale with three flats is the E-flat major scale. The key signature for E-flat major consists of three flats: B-flat, E-flat, and A-flat, arranged from left to right on the staff. The scale ascending from the first degree (E-flat) is E-flat, F, G, A-flat, B-flat, C, D, and returns to E-flat.
G-flat major scale has the most with 6 flats: b-flat, e-flat, a-flat, d-flat, g-flat, and c-flat.Of course, one could argue that other scales have more flats (such as C-flat major, F-flat major, B-double-flat major, etc), but these scales are typically notated as their enharmonic equivalent (e.g. A major instead of B-double-flat major).
the f major scale only has b flat in it. the order of flats is BEADGCF and the last flat in the order becomes the key when the key signiture has one flat.
if it's an A-Flat scale the first note is A-Flat...