Only one song of note - Good Vibrations, which eventually came out as a single - was officially released at the time, though various fragments have circulated in bootleg format down the years.
Back in 1967, with the album ready for release (press ads were already running), Wilson lost his nerve over some of the more experimental aspects of the record and asked for more time. As the Summer of Love rolled on, the Beatles beat Wilson to the punch with Sergeant Pepper's Lonely Hearts Club Band and the opportunity was gone. If this is half as good as the mythology says it is, then this could turn out to be another of those trippy summers. And we don't mean by charabanc to Margate.
What: Brian Wilson presents Smile
Subtitled: A Teenage Symphony to God
Where: Royal Festival Hall
When: 20-29 February