Song by the American band the Beach Boys…

Song by the American band the Beach Boys, released as a single in 1966 and produced by Brian Wilson, who wrote it with Mike Love. Assembled from fragments recorded over several months in multiple Los Angeles studios, it became one of the most expensive singles of its era. Its unusual sound includes cello and an Electro-Theremin, and it reached number one in both the United States and the United Kingdom.

The answer in 14 letters