Scale (music)
melodic minor: The step from F to G♯ is three half steps and difficult to sing. For this reason, F♯ is used instead of F, but only going up the scale. Except for some forms of Jazz music, the natural minor is used going down the scale: A, B, C, D, E, F♯, G♯, A, G, F, E, D, C, B, A.