SUPPLEMENT DATED APRIL 3, 2009 TO THE PROSPECTUSES DATED MAY 1, 2008 OF
                        SELIGMAN COMMON STOCK FUND, INC.
                              (THE "SELIGMAN FUND")

At a Special Meeting of Shareholders scheduled to be held on June 2, 2009,
shareholders who owned shares of the Seligman Fund on April 3, 2009 will vote on
the merger of the Seligman Fund into RiverSource Disciplined Equity Fund (the
"RiverSource Fund"), a fund that seeks to provide shareholders with long-term
capital growth.

For more information about the RiverSource Fund, please call 1-888-791-3380 for
a prospectus.