Scale / Song Key Conflict with Mixed in Key

[stringtapper]

Yes, in the first instance I was referring to the key signature.

In the second quote, I was speaking only in reference to this example. Obviously in the key of F# Major, you would want to refer to sharps as opposed to flats.

Word.

[crumhorn]

...Although when you get into more exotic scales (e.g. octatonic)...

Fortunately (for everyone) this is not something I'm likely to do

[djgrits7]

so guys, if a song is written in b flat major, am i safe to use scale and move it up to the a# without any problems... please be as simplistic as possible here, complete new...