Thanks for all of the replies. I'm sorry that my explanation wasn't complete enough. My question is about incomplete measures that are broken at the end of a stave of music. This happens fairly often in the narrow pages of a hymnal. The pick-up notes I mentioned are either at the beginning of the song or at a section break, where a verse ends and a refrain begins. Usually, these pick-up notes are full beats, but occasionally I've found half beats in the pick-up notes. Yes, the number of beats in the two parts (end of one stave and beginning of the next, or the beginning and end of the song, if the pick-up notes are at the beginning) adds up to a full measure. The documentation that I found in the book Behind Bars might be for orchestral music so there wouldn't be the issue of verses and refrain. I have attached one example: the first, second and last staves end with an incomplete measure and they are broken at half a beat. The rest of the measure is completed in the next stave system, the last stave being completed with pick-up notes at the beginning. According to the rule in Behind Bars, the staves should be open at the end, without barlines, but I guess the section breaks (end of verses and final bar) don't count as measure bars. So, I've been wondering what rules apply to vocal music?