F major and its relative harmonic minor, D minor, have only b flat.
It's not too bad, there's only three flats in the key signature; Bb, Eb, and Ab.
Bb is not necessarily an easier key, however it only has 2 flats in its key signature, whereas Ab has 4. So if you're composing for an instrument, the key of Ab would be better.
The key signature is E flat major, which is also, C minor, the relative minor of E flat major. You can find out what flat key signature you're in by finding the second to last flat (in this case E flat). It is the major version of that key signature!
A sharp key signature is one that contains sharps.
Bb or F
There is no key signature that has Bb and C#.
The scale that has two flats in its key signature is the key of Bb major.
The scale with 2 flats in its key signature is the key of Bb major.
The key signature will consist of two flats: Bb, and Eb.
Bb and Eb
It's not too bad, there's only three flats in the key signature; Bb, Eb, and Ab.
One flat, Bb.
Bb, Eb and Ab
Bb is not necessarily an easier key, however it only has 2 flats in its key signature, whereas Ab has 4. So if you're composing for an instrument, the key of Ab would be better.
The key signature for the C Dorian mode is two flats: Bb and Eb.
The key signature of a musical scale with two flats is Bb major.
The key with three flats (Bb, Eb, Ab) is the key of Eb.