Key signature may consist of one or more sharps combined with one or more flats (such as a signature containing both F and B). Key signatures of this kind can be found in the music of Béla Bartók, for example. The effect of a key signature continues throughout a piece or movement, unless explicitly cancelled by another key signature. For example, if a five-sharp key signature is placed at the beginning of a piece, every A in the piece in any octave will be played as A sharp, unless preceded by an accidental (for instance, the A in scale 2 illustrated –
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