Mendelssohn, Felix (Jakob Ludwig Felix Mendelssohn), 1809-47, German composer; grandson of the Jewish philosopher Moses Mendelssohn. Mendelssohn was one of the major figures in 19th-century music. His father, Abraham, upon conversion to Christianity, changed his surname to Mendelssohn-Bartholdy, a seldom-used form. A prodigy, reared in a highly cultured atmosphere, the young Felix presented his orchestral compositions to illustrious audiences at the family estate. His first mature work, the Overture to A Midsummer Night's Dream, was composed at 17, and he showed similar precocity at the piano. In 1829, he conducted the St. Matthew Passion, stimulating a revival of interest in the music of J. S. Bach. He was musical director (1833-35) at Düsseldorf, became (1835) conductor of the Gewandhaus concerts, Leipzig, and helped found (1842-43) the Leipzig Conservatory. He was appointed (1841) director of the music section of the Academy of Arts, Berlin, and often conducted the London Philharmonic Orchestra. His music is characterized by emotional restraint, refinement, sensitivity, and a fastidious adherence to classical forms. Of his five symphonies, the Scottish (1842), Italian (1833), and Reformation (1832) are best known. Frequently performed are his Violin Concerto in E Minor (1845); The Hebrides Overture or Fingal's Cave (1832); and two oratorios, St. Paul (1836) and Elijah (1846). Outstanding piano works include the Variations sérieuses (1841) and eight sets of Songs without Words (1832-45). He also composed chamber music, songs, choral music, and six organ sonatas.