Music Notation - Gardner Read
- An amazing book that goes through standard notation for each group of instruments. Touches on more modern notational ideas, but a bit lacking, which is actually to its credit because modern notation conventions have changed since it was written. Overall, virtually any notation you see in this book will be 100% acceptable.
Music Notation in the 20th Century - Kurt Stone
- A little better for 20th century techniques, but at this point a bit outdated so some of the "modern standards" aren't really standards, but still very good.
Behind Bars - Elaine Gould
- This is unarguably the best notation book today. It is more exhaustive than either of the above and is the top of its class. It is definitely a reference book however, as it's well over 600 pages. If you want something to read through to get a good grasp of basic notational practice, this is not for you (I recommend Read for that). It even touches on engraving techniques, although in less detail than the text below.
Music Engraving Today: The Art and Practice of Digital Notesetting - Steven Powell
- This is THE best book I've found for the minutiae of engraving. It's not about notation so much as making your scores look professional. It's the only engraving book made since personal computers became viable engraving tools (last edited 2007, and actually in need of an update) and as such is the only really practical engraving book I've seen. It goes over things like paper weights and dimensions, margins, vertical and horizontal spacing, proofreading, editing, etc.
I know you already have it on the list, but if someone's actually interested in modal counterpoint (I'm not sure why you would be, but that's a discussion for another day
) I highly recommend Peter Schubert's Modal Counterpoint, Renaissance Style over the Fux. Fux's book is okay, but doesn't really have any exercises beyond writing above a c.f. whereas Schubert's is much easier to learn more organic writing from, while still giving you the rundown on species counterpoint.
Also, Kostka and Payne's Tonal Harmony is a great book and kind of the more modern "standard" which used to be Piston.