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B♭ major or B-flat major is a major scale based on B-flat, consisting of the pitches B♭, C, D, E♭,...

B♭ major or B-flat major is a major scale based on B-flat, consisting of the pitches B♭, C, D, E♭, F, G, and A. Its key signature has two flats, B/E (see below: Scales and keys). Its relative minor is G minor, and its parallel minor is B♭ minor. B-flat major is a suitable key for most wind instruments, especially those for which it is their home key, such as clarinets, trumpets, saxophones, and the flutes in B-flat. Haydn's Symphony No. 98 is credited as the first symphony he (or anyone else) wrote in that key in which he included trumpet and timpani parts. Actually, his brother Michael Haydn had written one such symphony earlier, No. 36. Though Joseph still gets credit for writing the timpani part at actual pitch with an F major key signature (instead of transposing with a C major key signature), a procedure that made sense since he limited that instrument to the tonic and dominant pitches. Many editions of the work, however, use no key signature and specify the instrument as "Timpani in B flat - F." Five of Mozart's piano concerti are in B-flat major. See also: List of symphonies in B flat major