A Dictionary of Music and Musicians/Cue
CUE, i. e. queue, the tail of the preceding passage. Where a player or singer is reading from a separate part, and not from the score, some help is advisable to aid him in coming in correctly after the long pauses. A few notes of some other part immediately preceding the entrance of his own are therefore printed small in the stave as a guide; and this is called a cue:—
