Sagittarius was the “sunshine pop” pet project of songwriter and producer Gary Usher. He was a co-writer of some well-known Beach Boys songs, such as “In My Room” and “409.” He produced the English duo Chad & Jeremy, and later, the group Peanut Butter Conspiracy. Sagittarius released just two albums, Present Tense and The Blue Marble. Sagittarius wasn’t a band as such; its members were studio pros along for the ride, among them Beach Boy Bruce Johnston, his Bruce and Terry partner Terry Melcher, and Glen Campbell. Producer Curt Boettcher was involved with much of the material, although not on this track.
AllMusic describes the song “My World Fell Down” as “totally enthralling”. The lead vocal is by a well-disguised Glen Campbell. The orchestration owes much to the Beach Boys recordings of the Pet Sounds era — the bouncy chorus is awfully close to “Good Vibrations,” and the drum fills could have been copped from “God Only Knows” (in fact, Hal Blaine in both cases!). The song, written by John Carter and Geoff Stephens, was first recorded by the English band The Ivy League. Sagittarius’ single version, released in 1967, reached #70 on the Billboard chart.
After an intro in G# major, the verse shifts to G# minor, then to F# major at 0:25 for the chorus. More shifts continue throughout. A short passage of musique concrète (or psychedelia, if you will) begins at 1:48. Unusually, that snippet appears on the single edit only; it was replaced in the LP edit by an instrumental passage. The next section feels like a direct appropriation from “Good Vibrations”: a subdued vocal passage, to contrast with the ebullient chorus that follows. A keyboard coda takes us full circle to where we began in G# major.