The score of the D major penultimate one has huge chunks of the (*) left hand of the solo part missing.
The second movement of one of these pieces by this composer begins with the muted first violins playing the following notes alternately lower and higher:  F (pause) C-A (pause) F-C. The E-flat major "Larghetto" second movement of one of these pieces in C minor is in cut common time, and omits the trumpets and timpani. The E-flat major ninth of these pieces begins with the soloist interrupting the orchestra almost right away. The score of the D major penultimate one has huge chunks of the (*) left hand of the solo part missing. A turbulent theme is sandwiched by a serene B-flat major one in the "Romanze" second movement of the twentieth of these pieces, one of only two in a minor key. They includes pieces nicknamed Jeunhomme, Coronation, and Elvira Madigan. For 10 points, name these twenty-seven pieces by Mozart, for a solo keyboard instrument and orchestra. 
The second movement of one of these pieces by this composer begins with the muted first violins playing the following notes alternately lower and higher:  
piano concertos by Wolfgang Amadeus Mozart [prompt on "Mozart concertos"; prompt on "Mozart pieces"; prompt on "piano concertos" until after "Mozart" is read, after which you can accept it] 