The pilot 's opening and ending songs were two similar Calypso - styled tracks written by John Williams and performed by Sherwood Schwartz impersonating singer Sir Lancelot. The lyrics of both were quite different from those of the TV series and the pilot 's opening theme song was longer. The short scenes during this initial music include Gilligan taking the Howells ' luggage to the boat before cast - off and Gilligan attempting to give a cup of coffee to the Skipper during the storm that would ultimately maroon the boat.
who sang the original theme song for gilligan's island
Sir Lancelot