1.158 key
ES: tonalidad, I: tonalità, F: tonalité, D: Tonart, NL: toonsoort, DK: toneart, S: tonart, FI: tonaliteetti.
According to the 12 tones of the chromatic scale there are 12 keys, one on c, one on c-sharp, etc.
See also
chromatic scale, key signature.