O zittre nicht, mein lieber Sohn most demanding in operatic repertoire. In the preceding scene, Prince Tamino was shown a portrait of the Queen's daughter Pamina and fell instantly in love with her, singing of his feelings in the aria "Dies Bildnis ist bezaubernd schön". The Queen then makes a dramatic entrance, preceded by the Three Ladies calling to Tamino "Sie kommt! Sie kommt!" ("[Here] she comes!"). The grand entrance music for the Queen is in B-flat, marked "Allegro maestoso", with the following stage direction: Not all modern productions adhere to this prescription. In the aria, the Queen first quiets Tamino's fears and attempts to befriend
Piano concertos by Wolfgang Amadeus Mozart it was probably J.C. Bach, whom Mozart admired, who introduced the structural innovation of allowing the keyboard to introduce new thematic material in its first entry. Concertos Nos 1–4 (K. 37, 39, 40 and 41) are orchestral and keyboard arrangements of sonata movements by other composers. The next three concertos (K. 107/1, 2 and 3), which are not numbered, are arrangements of piano sonatas by J.C. Bach (Op 5. Nos. 2, 3, and 4, all composed by 1766). Based on handwriting analysis of the autographs they are believed to date from 1771–72. Concerto No. 5, K. 175 from 1773 was