Conversation so far:
what did Simon & Garfunkel do in the studio?
Simon & Garfunkel's fourth studio album, Bookends, was recorded in fits and starts from late 1966 to early 1968.
did Simon & Garfunkel record any other albums in the studio from late 1966 to early 1968.?
did something happen with Simon & Garfunkel in 1967?
Although the album had long been planned, work did not begin in earnest until late 1967.

Question: did the albums sell well?
Self-contained rewrite: did the Simon & Garfunkel album that had long been planned sell well?