These two major were once part of the big six until 1999. EMI (founded March 31, 1931 as Electric and Musical Industries and folded into Universal Music Group on September 28, 2012) Predecessor companies, 1898-1931 Gramophone Company (founded April 1898) Independent, 1898-1929 Radio Corporation of America, 1929-1931 Columbia Graphophone Company (founded February 13, 1917) Columbia Phonograph Company, 1917-1922 Independent, 1922-1931 Radio Corporation of America, 1931-1935 Independent, 1935-1979 (as Electric and Musical Industries until 1971 and as EMI from 1971 onwards) Thorn EMI, 1979-1996 EMI Group, 1996-2007 Terra Firma Capital Partners, 2007-2011 Citigroup, 2011-2012 Polygram (founded 1962 as Grammophon-Philips Group and folded into Universal Music Group on December 10, 1998) Predecessor companies, 1898-1962 Deutsche Grammophon Gesellschaft (founded 1898) Independent, 1898-1941 Siemens, 1941-1962 Philips Phonografische Industrie (founded 1929 as Hollandsche Decca Distributie)...