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 /
Absolute pitch may lead to playing in a tonality that is slightly different from that of the rest of the group. Absolute pitch shows a genetic overlap with synesthesia/ideasthesia, and some individuals with music-related synesthesia also have perfect pitch. They may associate certain notes or keys with different colors, enabling them to tell what any note or key is. It is unknown how many people with perfect pitch are also synesthetes. Absolute pitch is not a prerequisite for skilled musical performance or composition. However, musicians with absolute pitch tend to perform better on musical transcription tasks (controlling for age of onset and