Publishing Company, affiliated to ASCAP in the US and related to the works of Rodgers & Hammerstein.
Founded in 1945 by Richard Rodgers and Oscar Hammerstein II.
They both have a father called 'William', hence: son of William (Williamson).
Also credited as: Williamson Mus.
Please, consider also Williamson Music, Inc., label, Williamson Music Ltd. or Williamson (2).