B Locrian is the last mode and last special key of that mode which corresponds with C Ionian. C Ionian is a special mode and key as discussed by Heuristic 3 and because all the notes in B Locrian, B, C, D, E, F, G, A, B, are the same as the notes in C Ionian (but in a different order than starting on C as would be the case in C Ionian), which are all just white keys on the piano. B Locrian has an interesting feel. Due to the b3, Locrian is a minor scale, but because Locrian has a b5, instead of a 5, if one were playing chords for the modes, a diminished chord instead of a minor chord would be the optimum choice for Locrian. Due to all the flats in Locrian it is not a great scale choice for some upbeat or positive music, though a bridge might be interesting for the right pieces.
Back to Media Efficiency Taxonomy.