Si mayor (abreviatura en sistema europeo Si M y en sistema americano B) es la tonalidad que consiste en la escala mayor de si, y contiene las notas si, do sostenido, re sostenido, mi, fa sostenido, sol sostenido, la sostenido y si. Su armadura contiene 5 sostenidos.Su tonalidad relativa es Sol sostenido menor, y su tonalidad homónima es Si menor. Su equivalente enarmónico es Do bemol mayor.La armadura de Si mayor es la que tiene menos sostenidos con tres líneas de éstos. En la clave de sol, se coloca el sostenido en La no en su esperada posición junto al Sol agudo, pues se sale del pentagrama, se coloca entonces debajo. En la clave de fa si sería posible hacerlo, pero debido a que en la música para piano resultaría en una falta de uniformidad que estorbaría la lectura a primera vista, la armadura de Si mayor es prácticamente la misma que la de la clave de sol. En la clave de Do en tercera, como ocurre en el cuarteto de cuerdas y música orquestal, la armadura de Si mayor es usualmente escrita justo entre dos líneas de sostenidos.generalmente se usa la escala de do en el pentagrama A pesar de que es fácil pensar que Si mayor es una escala extraña o incómoda debido a su distancia con C Mayor (como puede apreciarse en el círculo de quintas) o al elevado número desostenidos que contiene, Frédéric Chopin la consideraba cómo una de las más fáciles de tocar,argumentando que era más fácil para los dedos acceder a las teclas negras; por ello a menudosolía recomendar su aprendizaje a los estudiantes de piano primerizos, dejando para el finalla escala de C mayor por dicha razón (su ausencia de teclas negras la hacia la más difícil de todasde tocar con soltura). Es usada en sinestesia para representar el color azul. Nótese que en alemán, la nota Si (B americana) es llamada "H", y que Si bemol es llamada "B".

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In music theory, B major is a major scale based on B. The pitches B, C♯, D♯, E, F♯, G♯, and A♯ are all part of the B major scale. Its key signature has five sharps. B major's relative minor is G-sharp minor, its parallel minor is B minor, and its enharmonic equivalent is C-flat major. The key signature for B major is the least sharp key signature with three "lines" of sharps. In the treble clef, putting the sharp for A on its expected position relative to the sharp for G would require a ledger line. In the alto and bass clefs it would be possible to do this, but because in piano music (which uses the treble and bass clefs) this would result in a dissimilarity between the two staves that might throw off sight-reading, this is not usually done. However, it is occasionally found, resulting in the A-sharp in the bass-clef key signature appearing on the top line. In the tenor clef, which occurs in orchestral music, the B major key signature is usually written in just two "lines" of sharps. Although B major is usually thought of as a remote key (due to its distance from C major in the circle of fifths and its fairly large number of sharps), Frédéric Chopin regarded its scale as the easiest of all to play, as its black notes fit the natural positions of the fingers well; as a consequence he often assigned it first to beginning piano students, leaving the scale of C major till last because he considered it the hardest of all scales to play completely evenly (because of its complete lack of black notes). There are a few large-scale works in B major, including the last part of The Firebird by Igor Stravinsky, the Second Symphony by the Canadian composer Robert Farnon, the symphonic poem Tintagel by Sir Arnold Bax, and Glazunov's Second Piano Concerto (which ends not in B, but in E). Joseph Haydn's Symphony No. 46 is in B major. See also: List of symphonies in B major. The aria "La donna è mobile" from Verdi's opera Rigoletto is in B major. Johannes Brahms's Piano Trio No. 1, Op. 8 is in B major, though the piece ends in B minor. He also wrote the slow movement to his Second Symphony in B Major, as well as the fourth and last piece of the Ballades, Op. 10. Note that in German and most Central and Northern European languages, the pitch B is called "H" while B♭ is called "B". This includes Nordic, Baltic, Western and Southern Slavic (except Bulgarian) languages as well as Hungarian.

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