The 7 key signatures that you must memorize to understand how to calculate all 30 key signatures.
284362341 | C | 0 | |
284362342 | D | 2 | |
284362343 | E | 4 | |
284362344 | F | -1 | |
284362345 | G | 1 | |
284362346 | A | 3 | |
284362347 | B | 5 | |
284362348 | To find minor | subtract 3 | |
284362349 | To go from Major key to sharp key | Add seven | |
284362350 | To go from Major key to flat key | Subtract seven |