Key Signatures, Minor Minor Key SignaturesTo determine a minor key signature, first determine the major key, and go down three half steps. For example, the key of 2 sharps would be D major, but three half steps down from D is B. So, the key of 2 sharps is D major, or B minor. Minor Key Signature information from William Wieland’s theory websiteMinor Key Signature Handy Guide from William Wieland’s theory website jimnovak2021-10-31T20:49:58+00:00