Minor scale based on the accidentals of the "natural" minor scale, not on those of the harmonic or melodic minor scales. For example, a piece in E minor will have one sharp in its key signature because the E natural minor scale has one sharp (F). Major and minor keys that share the same key signature are "relative" to each other. For instance, F major is the relative major of D minor since both have key signatures with one flat. Since the natural minor scale is built on the 6th degree of the major scale, the tonic of the relative minor is
C-flat major major, although they usually notate this with accidentals in some other key signature, seldom a 7-flat key signature: for example: C major is used for Benjamin Britten's "Interlude" in C major for harp, several of Max Reger's Canons in All Major and Minor Keys (Book 1 Nos. 62 and 63, and Book 2 No. 48), and No. 29 from the "Thirty Preludes in All Major and Minor Keys" by Christian Heinrich Rinck. In some scores, the C major key signature in the bass clef is written with the flat for the F on the second line from the top. This