The concerto is innovative in many respects. In the first movement alone, Mendelssohn departs from the typical form of a Classical concerto in many ways, the most immediate being the entry of the soloist almost from the outset, which also occurs in his First Piano Concerto. Although the first movement is mostly in the conventional sonata form, Mendelssohn has the first theme played by the solo violin and then by the orchestra. Classical concertos typically opened with an orchestral introduction followed by a version of essentially the same material that incorporates the soloist.