The key in music with 5
sharps in the key signature: F#, C#, G#, D#, and A#. It can also refer to the
chord, which is the first, third, and fifth steps of
the B major scale: B, D#, and F#, respectively.
"So, the A# in the F#7
chord acts as a leading tone to the
tonic, B, in the B Major chord?
Exacty, Mr. Example Man."