👉 The ur-sigram, also known as a "Ursus" or "Ursus Minorum", is a type of musical notation used to represent different types of music scales. It consists of five lines, each representing one of the fundamental scales. Each line is made up of a series of notes that are separated by semitones (12 note steps). The Ursa Minorum is often used in classical and folk music to represent scales, such as C major, D major,