Sigismund Neekomm, chevalier, a German composer, born in Salzburg, July 10, 1778, died in Paris, April 3, 1858. He was educated by his kinsmen Michael and Joseph Haydn, and became in 1804 leader of the orchestra of the German opera in St. Petersburg, but was soon obliged to resign on account of ill health. He returned to Vienna in 1808, and subsequently he lived in Paris, in the house of Talleyrand, whom he accompanied in 1814 to the congress of Vienna. In 1816 he went with the duke of Luxemburg to Rio de Janeiro, and became a teacher of music at the Brazilian court. In 1821 he returned to Talleyrand's house, and, after visiting Italy and other parts of the continent, accompanied his patron in 1830 to England. Subsequently he again travelled extensively, and spent several years in Switzerland. During the latter part of his life he was partially blind, and resided alternately in London and Paris. His oratorio of "Mount Sinai," produced at Derby in 1831, and "David," at i Birmingham in 1834, are popular. He also produced an immense number of cantatas, songs, psalms, voluntaries for the organ, symphonies, lquartets, sonatas, etc, his compositions, vocal and instrumental, amounting to more than 800.