Source : Webster's Revised Unabridged Dictionary (1913)

Impresario \Im`pre*sa"ri*o\, n.; pl. {Impresarios}. [It., from
   impresa enterprise.]
   The projector, manager, or conductor, of an opera or concert
   company.

Source : WordNet®

impresario
     n : a sponsor who books and stages public entertainments [syn: {showman},
          {promoter}]