Dear, Dear Mr. Happy--

Sorry, but you aren't listening. Your last post lists 21 "keys."
There aren't 21 keys, there are 12! My advice about staring at a piano keyboard until the light comes on still holds. Starting at C (which because of theoretical matters you refuse to address is the logical place to start), the notes are:

C
C# which is also Db depending on which key you are in.
D
D# or Eb (one note, two names, as above)
E
F (notice I skipped E#/Fb which do/does not exist, despite your effort to create it two posts back) (PIANO KEYBOARD!!!!)
F#/Gb
G
G#/Ab
A
A#/Bb
B
and we're back to C, an octave above where we started, without B#/Cb, which likewise does not exist in this universe.

Now, here's what you do: Go back and read the sage Bernard's post, which is the second on this thread, the very first answer you got. That was the secret of existence, Grasshopper. Then read Amos' post, where he said the same thing. Then read mine. Then read Bernard's. Then read Amos's. Then read mine. Then read Bernard's. Then read Amos's. Then read mine..... (Re-do from start).

BTW, I've been doing this music thing since about 1954; I think you can trust me. As a former teacher, I hate to be brutal, but IMO you are fighting the problem. Don't memorize results: understand the principle and the results will come like ripe fruit falling off a tree. But, no, after FORTY POSTS (I counted) you're still talking like there's a B-sharp and a C-flat. I FIND THAT PERSONALLY VERY IRRITATING AND NON-COOPERATIVE, AND IF I HAVE ANYTHING TO SAY ABOUT IT, YOU WILL GET NO DESSERT TONIGHT !!!!! :)

(Goes off muttering to self under breath.......)

Chicken "Twelve Keys were Good Enough for Mozart" Charlie