It is the eighth track from the duo's fifth and final studio album, Bridge over Troubled Water.
The song was also issued as the B-side to the duo's "Cecilia" single.
Paul Simon wrote the song as a thinly veiled message to Art Garfunkel, referencing in the first stanza a specific incident where Garfunkel went to Mexico to act in the film Catch-22.
Simon refers to Garfunkel in the song as "Tom", alluding to their early days when they were called Tom and Jerry, and encourages him to "let your honesty shine .
[1] The background vocals feature both Garfunkel and Simon recorded together in an echo chamber, multi-tracked around eight times.