Whose song is The D'Oyly Carte Opera Company / Overture?

Artist		Album
The D'Oyly Carte Opera Company; Isidore Godfrey, conductor		Gilbert & Sullivan: Princess Ida CD 1 Gilbert & Sullivan: Iolanthe, CD1 Gilbert & Sullivan: The Pirates of Penzance CD 1 Gilbert & Sullivan: The Yeomen of The Guard CD1
The D'Oyly Carte Opera Company; Isidore Godfrey, conductor		Gilbert & Sullivan: H.M.S. Pinafore CD1