This catalogue illustrates
keys
with at least seven accidentals, these are
C-sharp major, C-flat major, A-sharp minor and A-flat minor.

Inspiration took place through the key of B-sharp major. With the use of enharmonic equivalents, no more than six accidentals are in common. Crossing this border, compositions become a curio. Therefore achieving a complete overview isnīt far away and reaching this goal a trifle.