I Do (The Castells song)
"I Do" is a song written by Brian Wilson and Roger Christian, originally released as a single by American vocal group the Castells on March 9, 1964. The recording was also produced and arranged by Wilson. The song's lyrics illustrate a young man getting ready for marriage. Its melody was derived from "County Fair", a song Wilson had earlier written for the Beach Boys.
According to Keith Mansfield, "the song didn't do much for the Castells, but it was a memorable experience ". Musicologist Philip Lambert noted: "The 'I Do' intro is directly inspired by the instrumental accumulation in 'Be My Baby' and in the earlier Phil Spector| Spector production of the Crystals' 'Oh Yeah Maybe Baby', which have similar rhythms and instrumental combinations."