Conversation so far:
what did Simon & Garfunkel do in the studio?
The duo's fourth studio album, Bookends, was recorded in fits and starts over various periods from late 1966 to early 1968.
The duo were signed under an older contract.
did they record any other albums in the studio?
Simon & Garfunkel took advantage of this indulgence, hiring viola and brass players, as well as percussionists.
The record's brevity reflects its concise and perfectionist production.
did something happen in 1967?
The team spent over 50 studio hours recording "Punky's Dilemma", for example, and re-recorded vocal parts, sometimes note by note, until they were satisfied.
did the albums sell well?
For Simon, Bookends represented the end of the collaboration and became an early indicator of his intentions to go solo.
what record label was used for Bookends?
The duo were signed under an older contract.

Question: did something happen in 1968?
Self-contained rewrite: Did something happen to Simon & Garfunkel in 1968?