Nothing like unearthing a month-old post just to be pedantic....
But I am kind of behind on my BBS reading.

I just wanted to correct a few mis-statements in this thread.

1. The German system actually uses "B" to represent what we call B-flat, and it uses "H" to represent what we call B (not B-flat as was stated here).
So much for the vaunted German logic. Looks like it was on vacation for a while, as having the note "H" come between "B" and "C" isn't too logical. (I know, I know it actually makes some sense if you know the history behind it.)

2. C9 means add the dominant 7 and the 9.
Cadd9 specifically means do NOT add the 7th.

3. sus2 DOES mean to omit the 3rd, while 9 and add9 mean "do not omit the 3rd"
Sure, if you're a keyboard player, feel free to throw the 3rd into a sus2, but realize that you're actually making a slight chord substitution. (Which is cool, musical rules are meant to be understood, then broken with impunity. For example, classical counterpoint says "no parallel fifths EVER" while hard rock is built almost ENTIRELY on parallel fifth "power chords.")

/music

P.S. Hey look everybody! After two years of casual posting, I'm finally a "member." (Insert Beavis laugh here.)
At this rate, only two more years until I get "enthused."