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
E-flat major Beethoven's (hypothetical) 10th symphony is in the key of E-flat major. But even before Beethoven, Francesco Galeazzi identified E-flat major as "a heroic key, extremely majestic, grave and serious: in all these features it is superior to that of C." Three of Mozart's completed horn concertos and Joseph Haydn's famous Trumpet Concerto are in E-flat major and so is Anton Bruckner's Fourth Symphony with its prominent horn theme in the first movement. Another famous heroic piece in the key of E-flat major is Richard Strauss's "A Hero's Life". The heroic theme from the Jupiter movement of Holst's "The Planets" is