It is also the leading tone in b-flat minor and the supertonic in G major.  
This note is the submediant of C major and mediant of f-sharp minor.  It is also the leading tone in b-flat minor and the supertonic in G major.  It is a fifth above D, and is written on the middle line of tenor clef, the top line of the bass clef, and the space below the middle line of the treble clef.  FTP, name this note, to which orchestras generally tune, set by international convention at 440 hertz.
This note is the submediant of C major and mediant of f-sharp minor.  
A