Kous·se·vitz·ky 
(k′sə-vĭtskē), Sergei Aleksandrovich Known as "Serge." 1874-1951.
(k′sə-vĭtskē), Sergei Aleksandrovich Known as "Serge." 1874-1951. Russian-born American conductor of the Boston Symphony Orchestra (1924-1949) noted for his support of contemporary composers.