Musical Definition: This score makes some use of cautionary accidentals. These are accidentals which don't change the pitches to be played, but rather are used as a precaution against forgetting that they are there. This usually happens when an accidental in the written key signature is changed for a significant number of measures, and then suddenly changes back. The cautionary accidental would be applied when the standard key signature returns, to remind the musician of the key signature.

LilyPond Notation: These are notated in LilyPond with an exclamation mark placed before the note-value: ces!16