A note there Dirt, there is no such key as A# major. It's Bb major and A# minor (enharmonic Bb minor). In either case, you wouldn't see the note as B# on the staff. In A# minor, B# has no accidental beside it. It's just a note on the B line so it doesn't look like a C. In written music. it's not as confusing as you think. Writting the note on the C line when you meaning to play B# (second tone in the key of A# minor). You would have to write the note natural on the C line to have it be played the same pitch as B# (other wise it's C#). Even then it's 3 lines above the root so it's even more confusing. Enharmonic keys are kind of confusing on the piano, but trying to think up ways to manipulate them just makes it more confusing. Probably why hardly anybody writes in those keys anymore. It's a shame musicians now are more concerned with shortcuts and the easy way out.