Key signature sometimes called "standard key signatures". Other scales are written either with a standard key signature and use accidental as required, or with a nonstandard key signature. Examples of the latter include the E (right hand), and F and G (left hand) used for the E diminished (E octatonic) scale in Bartók's "Crossed Hands" (no. 99, vol. 4, "Mikrokosmos"), or the B, E and F used for the D Phrygian dominant scale in Frederic Rzewski's "God to a Hungry Child". The absence of a key signature does not always mean that the music is in the key of C major /
Minor scale lowered 7th degree found in the natural minor in order to avoid the augmented triad (III) that arises in the ascending form of the scale. In jazz, only the ascending form of the scale is usually used. Examples of the use of melodic minor in rock and popular music include Elton John's "Sorry Seems To Be The Hardest Word", which makes, "a nod to the common practice... by the use of F [the leading tone in G minor] as the penultimate note of the final cadence." In modern notation, the key signature for music in a minor key is typically