The "aperto" marking on the first movement is rare in Mozart's instrumental music (two of his piano concerti, Piano Concerto No. 6 in B Major and Piano Concerto No. 8 in C Major, have this marking, as does his Oboe Concerto in C Major), but appears much more frequently in his operas. It implies that the piece should be played in a broader, more majestic way than might be indicated simply by "allegro." The first movement opens with the orchestra playing the main theme, a typical Mozartian tune. The solo violin comes in with a short but sweet dolce "adagio" passage in A major with a simple accompaniment by the orchestra. (This is the only instance in Mozart's concerto repertoire in which an "adagio" interlude of this sort occurs at the first soloist entry of the concerto.) It then transitions back to the main theme with the solo violin playing a different melody on top of the orchestra. The first movement is 10–11 minutes long.