Turntables with fingering pictures for the tunings g-c-e-a and d-g-h-e - Front: chord charts for ukulele g-c-e-a - Back:chord charts for baritone ukulele d-g-b-e - The circle of fifths is used to recognize all keys with accidentals and to find all cadences in major and minor. The rotating disc, measuring 21 x 21 cm, fits into any DIN A4 notebook. It is ideal as a teaching material, as well as a template for song accompaniment.