Context: Music is an art form and cultural activity whose medium is sound and silence, which exist in time. The common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics (loudness and softness), and the sonic qualities of timbre and texture (which are sometimes termed the "color" of a musical sound). Different styles or types of music may emphasize, de-emphasize or omit some of these elements. Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment) and pieces that combine singing and instruments. The word derives from Greek  ("mousike"; "art of the Muses"). In its most general form, the activities describing music as an art form include the production of works of music (songs, tunes, symphonies, and so on), the criticism of music, the study of the history of music, and the aesthetic examination of music. Ancient Greek and Indian philosophers defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as "the harmony of the spheres" and "it is music to my ears" point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound.", Aerobic gymnastics or sport aerobics is a competitive sport originating from traditional aerobics in which complex, high-intensity movement patterns and elements of varying difficulty are performed to music. In addition to aerobics, it combines elements of acrobatic gymnastics, rhythmic gymnastics and often artistic gymnastics along with music, dance and choreography., Rhythmic gymnastics is a sport in which individuals or groups of five or more manipulate one or two pieces of apparatus: rope, hoop, ball, clubs, ribbon and freehand (no apparatus). Rhythmic gymnastics is a sport that combines elements of ballet, gymnastics, dance, and apparatus manipulation. The victor is the participant who earns the most points, determined by a panel of judges, for leaps, balances, pirouettes (pivots), apparatus handling, and execution. The choreography must cover the entire floor and contain a balance of jumps, leaps, pivots, balances (there is a certain number depending on which level you are) and flexibility movements. Each movement involves a high degree of athletic skill. Physical abilities needed by a rhythmic gymnast include strength, power, flexibility, agility, dexterity, endurance and hand-eye coordination., Artistic gymnastics is a discipline of gymnastics in which athletes perform short routines (ranging from approximately 30 to 90 seconds) on different apparatus, with less time for vaulting. The sport is governed by the Fédération Internationale de Gymnastique (FIG), which designs the Code of Points and regulates all aspects of international elite competition. Within individual countries, gymnastics is regulated by national federations, such as British Gymnastics in the United Kingdom and USA Gymnastics in the United States. Artistic gymnastics is a popular spectator sport at the Summer Olympic Games and in other competitive environments., Aerobics is a form of physical exercise that combines rhythmic aerobic exercise with stretching and strength training routines with the goal of improving all elements of fitness (flexibility, muscular strength, and cardio-vascular fitness). It is usually performed to music and may be practiced in a group setting led by an instructor (fitness professional), although it can be done solo and without musical accompaniment. With the goal of preventing illness and promoting physical fitness, practitioners perform various routines comprising a number of different dance-like exercises. Formal aerobics classes are divided into different levels of intensity and complexity. A well-balanced aerobics class will have five components: warm-up (5-10 minutes), cardio vascular conditioning (25-30 minutes), muscular strength and conditioning (10-15 minutes), cool-down (5-8 minutes) and stretching and flexibility (5-8 minutes). Aerobics classes may allow participants to select their level of participation according to their fitness level. Many gyms offer a variety of aerobic classes. Each class is designed for a certain level of experience and taught by a certified instructor with a specialty area related to their particular class., Choreography is the art or practice of designing sequences of movements of physical bodies (or their depictions) in which motion, form, or both are specified. "Choreography" may also refer to the design itself. A choreographer is one who creates choreographies by practicing the art of choreography, a process known as "choreographing". Choreography is used in a variety of fields, including musical theater, cheerleading, cinematography, gymnastics, fashion shows, ice skating, marching band, show choir, theatre, synchronized swimming, cardistry, video game production and animated art. In the performing arts, choreography applies to human movement and form. In dance, choreography is also known as dance choreography or "dance composition"., 9th Aerobic Gymnastics World Championships were held in Nanjing , China from June 1 to June 3 , 2006 ., Acrobatic gymnastics (previously called sport acrobatics) is a competitive gymnastic discipline where partnerships of gymnasts work together and perform figures consisting of acrobatic moves, dance and tumbling, set to music. There are three types of routines; a 'balance' routine where the focus is on strength, poise and flexibility; a 'dynamic' routine which includes throws, somersaults and catches, and (at FIG level 6 and above) a 'combined' routine which includes elements from both balance and dynamic., Subject: 2006 aerobic gymnastics world championships, Relation: sport, Options: (A) artistic gymnastics (B) cheerleading (C) gymnastics (D) ice skating (E) music (F) rhythmic gymnastics (G) sport (H) sport aerobics (I) synchronized swimming
Output: sport aerobics