Si menor (abreviatura en sistema europeo Sim y en sistema americano Bm) es la tonalidad que consiste en la escala menor de Si, y contiene las notas si, do sostenido, re, mi, fa sostenido, sol la y si. Su armadura contiene 2 sostenidos. Su relativo mayor es Re mayor, y su tonalidad homónima es Si mayor.Las alteraciones para las versiones melódicas y armónicas son escritas si son necesarias.

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B minor is a minor scale consisting of the pitches B, C♯, D, E, F♯, G, and A. Its key signature consists of two sharps. The harmonic minor raises the note A to A♯. Changes needed for the melodic and harmonic versions of the scale are written with accidentals as necessary. Its relative major is D major, and its parallel major is B major. 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 his St John Passion. By the end of the Baroque era, however, conventional academic views of B minor had shifted: Composer-theorist Francesco Galeazzi (1758–1819) opined that B minor was not suitable for music in good taste. Beethoven labelled a B minor melodic idea in one of his sketchbooks as a "black key". Brahms, Dvořák, Schubert, Liszt, Chopin, Borodin, and Tchaikovsky all wrote significant works in B minor.

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