In traditional Arabic music, maqam is the system of melodic modes, which is mainly melodic. The word maqam in Arabic means place, location or position. The Arabic maqam is a melody type. It is "a technique of improvisation" that defines the pitches, patterns, and development of a piece of music and is "unique to Arabian art music". There are 72 heptatonic tone rows or scales of maqamat. These are constructed from augmented, major, neutral, and minor seconds. Each maqam is built on a scale, and carries a tradition that defines its habitual phrases, important notes, melodic development and modulation. Both compositions and improvisations in traditional Arabic music are based on the maqam system. Maqamat can be realized with either vocal or instrumental music, and do not include a rhythmic component.