WIKIPEDIA:

“ "Good Vibrations" is a song by American rock band The Beach Boys. Composed and produced by Brian Wilson, the song's lyrics were written by Wilson and Mike Love.
Released as a single on October 10, 1966 (backed with the Pet Sounds instrumental "Let's Go Away For Awhile"), it was The Beach Boys' third U.S. number-one hit, reaching the top of the ''Billboard'' Hot 100 chart in December 1966, as well as being their first British chart-topper. Initiated during the sessions for the Pet Sounds album, it was not taken from or issued as a lead single for an album, but as a stand-alone single, although it would be later considered for the ill-fated SMiLE project. It would ultimately be placed on the album Smiley Smile eleven months after its release.
Wilson's publicist Derek Taylor described "Good Vibrations" as a "pocket symphony". It featured instruments unusual for a psychedelic rock/pop song, including prominent use of the cello and an electro-theremin. It is number six on Rolling Stones list of the "500 Greatest Songs of All Time."

Composition
Wilson recounted the genesis of the title "Good Vibrations" in his 1995 biopic, I Just Wasn't Made for These Times, and at other times. [......] ”

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