Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary.
In Baroque times, B minor was regarded as the key of utter despair. The theorist Christian Friedrich Daniel Schubart (1739–1791) regarded B minor as a key expressing a quiet acceptance of fate and very gentle complaint, something commentators find to be in line with Bach's use of the key in the St John Passion. By Beethoven's time, however, the perception of B minor had changed considerably: Francesco Galeazzi wrote that B minor was not suitable for music in good taste, and Beethoven labelled a B minor melodic idea in one of his sketchbooks as a "black key".
It is a common key used in rock, folk, country and other guitarist-based styles because the standard tuning of a guitar causes all the open strings to be scale degrees of B minor.
^Michael C. Tusa, "Beethoven's 'C-Minor Mood': Some Thoughts on the Structural Implications of Key Choice" in Beethoven Forum 2, Christoph Reynolds, ed. Lincoln: University of Nebraska Press (1993): 2–3, n. 5
^Michael C. Tusa, "Beethoven's "C-Minor Mood": Some Thoughts on the Structural Implications of Key Choice" in Beethoven Forum 2, Christoph Reynolds, ed. Lincoln: University of Nebraska Press (1993): 2, n. 3