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 /
The Signature Series featured in the episode are mentioned. On SoundCloud, the pieces in each episode are timed such that when the piece changes, the pop-up comment identifies the piece being played, together with the composer who wrote the music. Each key has an image, with its name, its nickname, and a person (or animal, in the case of C minor) whose personality is representative of that key on it, except for C major, whose picture is that of the sky and the sea, with no people featured. Ben Didier of CBC music is the designer for the images. The Signature Series is