I always thought of the comma as a breath mark, but I was recently looking through Elaine Gould's 'Behind Bars' notation guide, and, in it, the 'tick' is recommended over the comma. She writes that while the comma does direct the performer to take a breath, it indicates that a small amount of time should be added, for this breath, as opposed to the tick, which takes time off of the note before which it occurs. Good? Bad? Ugly? I'm asking in relation to wind and brass notation.