What characteristic notes define the Locrian mode?

The Locrian mode is defined by its unique scale structure, which incorporates specific altered scale degrees. In the case of the choice that identifies the B scale with lowered second (b2), lowered third (b3), lowered fifth (b5), lowered sixth (b6), and lowered seventh (b7), all these changes contribute to the distinctive sound of the Locrian mode.

The Locrian mode is often viewed as the seventh mode of the major scale, where it is derived from the major scale by starting on the seventh degree. This lowering of specific scale degrees results in a diminished sound, typical of the Locrian. The notes of the B Locrian scale are B, C, D, E, F, G, and A, which match the characteristics outlined in the option.

This option accurately reflects the modal characteristics of Locrian, offering a foundation for understanding how these alterations shape the aural quality and harmonic possibilities of music written in this mode. Other choices represent different scales or modes that do not align with the defining aspects of Locrian, emphasizing how unique scale alterations play a critical role in defining musical modes.