On the same page, a euphemism for "lockstep," is a phrase dated only to 1965 according ot he OED. He gives the alternatives sing from the same hymnbook or hymn sheet, and sing the same song or tune. He also relates it to "on message." There are two other really common idioms in this song: She mentions right at the beginning that she’s “messed up,” which is the same as “mixed up.” And—you guessed it—she also mentions that she’s going crazy! Example: We were trying to drive to the swimming pool, but we got our directions mixed up. Fortunately, we asked a woman ... Synonyms for singing from the same song sheet in Free Thesaurus. Antonyms for singing from the same song sheet. 41 synonyms for sing: croon, carol, chant, trill ...

sing from the same hymnal; sing from the same hymn sheet; Verb . sing from the same hymnbook (idiomatic, of two or more people) To make the same or similar statements, especially to express the same opinions in public as a result of a prior agreement. 2002, Michael Wallace, "Greenspan Puts on a Happier Face," BusinessWeek, 25 Jan. (retrieved 12 ...