Si-bemol major. Si-bemol major (B-dur deb ham ataladi) — tonikasi si-bemol notasidan boshlanadigan major tonalligi. Kalitoldi belgilari 2 ta: si-bemol va mi-bemol. Nota yozuvida quyidagicha yoziladi: \omit Score.TimeSignature \relative c' { \key bes \major \time 7/4 bes c d es f g a bes a g f es d c bes2 \clef F \key bes \major