What is D major?
{{see also|D minor}} {{Infobox Scale | image_name=D_Major_key_signature.png | scale_name=D major | relative=[[B minor]] | parallel=[[D minor]] | first_pitch=D | second_pitch=E | third_pitch=F{{music|sharp}} | fourth_pitch=G | fifth_pitch=A | sixth_pitch=B | seventh_pitch=C{{music|sharp}} }} '''D major''' is a [[major scale]] based on [[D (musical note)|D]]. Its [[key signature]] has two sharps. Its [[relative key|relative minor]] is [[B minor]]. D major is good for [[violin]] music because of the structure of the instrument, which has its four strings tuned to G D A E. The open strings [[resonate]] with the D string, producing a special rich sound. Because of this, many [[Western classical music|classical]] [[composer]]s chose to write [[violin concerto]]s in D major. Examples include [[Wolfgang Amadeus Mozart|Mozart's]] ([[Violin Concerto No. 2 (Mozart)|No. 2, 1775]], [[Violin Concerto No. 4 (Mozart)|No. 4, 1775]]); [[Ludwig van Beethoven's]] ([[Violin Concerto (Beethoven)|1806]]); [[Niccolò Paganini|Paganini's]] ([[Violin Concerto No. 1 (Paganini)|No. 1, 1817]]); [[Johannes Brahms|Brahms's]] ([[Violin Concerto (Brahms)|1878]]); [[Pyotr Ilyich Tchaikovsky|Tchaikovsky's]] ([[Violin Concerto (Tchaikovsky)|1878]]); [[Sergei Prokofiev|Prokofiev's]] ([[Violin Concerto No. 1 (Prokofiev)|No. 1, 1917]]); [[Igor Stravinsky|Stravinsky's]] ([[Violin Concerto (Stravinsky)|1931]]); and [[Erich Wolfgang Korngold|Korngold's]] ([[Violin Concerto (Korngold)|1945]]). It is also suitable for [[guitar]] music, with [[drop tuning]] for the lowest string making two Ds as [[open strings]]. For some beginning wind instrument students, however, D major is not a very good key, because it [[transposes]] to [[E major]] for B flat instruments. E major has four sharps, which is harder for new learners to play. Still, the [[clarinet]] in B-flat is often used for music in D major. It is probably the key with the most sharps that it can play well. However, when some composers write a piece in D minor with B-flat clarinets, t