sing the same tune

sing the same tune

  (British, American & Australian) also sing from the same hymnsheet/songsheet (British)
if a group of people sing the same tune, they say the same things about a subject in public (usually in continuous tenses) I want to make sure we're all singing the same tune before we give any interviews to the newspapers.
See also: same, sing, tune
References in classic literature ?
The nightingales in the forests about here all sing the same tune, and in the same key of (E flat).