Background: A marching band is a group in which instrumental musicians perform while marching, often for entertainment or competition. Instrumentation typically includes brass, woodwind, and percussion instruments. Most marching bands wear a uniform, often of a military style, that includes an associated school or organization's colors, name or symbol. Most high school marching bands, and some college marching bands, are accompanied by a color guard, a group of performers who add a visual interpretation to the music through the use of props, most often flags and rifles.
Context: Traditional Style bands, also known as Show Bands, are marching bands geared primarily towards crowd entertainment and perform on football fields. Typically, they perform a routine before the game, another at halftime, and sometimes after the game as well. Competitive show bands perform only one show that is continually refined throughout a season, while bands that focus on entertainment rather than competition usually perform a unique show for each game. These shows normally consists of three to five musical pieces accompanied by formations rooted in origin from Patterns in Motion, a book penned by band director William C. "Bill" Moffit, bandmaster of Purdue University All-American Marching Band and University of Houston Spirit of Houston. A recognizable style of show band is the one fielded by historically black colleges and universities (HBCUs). HBCU bands utilize the traditional "ankle-knee" high step and music selections are largely based on R&B, hip-hop, and contemporary popular music. In addition to traditional drill formations, HBCU bands feature heavily choreographed dance routines as part of their performances. Many of these bands may have a twirler line and/or a dancer line, but not necessarily flag twirlers. One of the most notable depictions of HBCU bands is the film Drumline. HBCU bands are a significant part of African-American musical culture and HBCU bands often surpass their associated football teams in popularity, a phenomenon that is uncommon among collegiate and high school marching bands. In 1989, as part of the celebrations for the bicentennial of the French Revolution, the Florida A&M University Marching 100, one of the most prolific HBCU bands in the country, was selected as the official representative of the United States in the bicentennial parade. Another style of show band is that used by many of the Big Ten Conference marching bands, a semi-military and semi-corps style. These bands perform a show that is designed to entertain the audience, but feature more traditional symphonic styles of music (marches, film scores, jazz, or older pop music) as well as some contemporary music. Big Ten style show bands have been influential in creating some of the earliest marching band innovations, and the style is used in high schools throughout much of the United States. Most show bands of either type include the traditional military band instrumentation of woodwinds, brass, and battery percussion. Some also include the front ensemble keyboard percussion, and may also incorporate the use of a color guard for flag, and rifle routines as well as a dance line. Many bands have auxiliaries that add a visual component to the performance. For ceremonial bands, this could be a traditional color guard or honor guard. For drum & bugle corps and corps-style field bands, this could include Dance lines, majorettes, Auxiliary units may be collectively referred to as color guard or visual ensemble. Auxiliaries may perform as independent groups. In the early 1970s, color guards began to hold their own competitions in the winter (after the American football season, and before the beginning of the summer drum and bugle corps season). These became known as winter guard. There are also numerous dance competitions in the off-season. The color guard of a marching band or drum and bugle corps may contain sabers, mock rifles, and tall flags. In modern bands, other props are often used: flags of all sizes, horizontal banners, vertical banners, streamers, pom-poms, even tires, balls, and hula hoops or custom built props. The color guard may also employ stage dressing such as backdrops, portable flats, or other structures. These can be used simply as static scenery or moved to emphasize block drill, and are often used to create a "backstage" area to store equipment and hide personnel. While military color guards were typically male, band color guards tend to be primarily female, though it is becoming more common for men to join as well. A few independent units are all-male. Guard members nearly always wear a special uniform or costume that is distinctive from that of the band, not necessarily matching in design or color. The men's and women's guard uniforms are usually designed in one of two ways: nearly identically, but with gender-specific parts (i.e. skirts) adapted for the use of the opposite sex; or complimentarily, with the two uniforms designed similarly but with variations in color or form. The color guard uniform, especially in a high school marching band, need not be in school colors; in fact, they rarely are. These uniforms are designed to represent a certain aspect of the halftime show, characterize the guard members through costumes, or tell some sort of story, and can thus be in any design or color (a surprisingly common complaint among the high school audience is that guard uniforms and equipment "aren't school colors"). Indoor color guards have become popular within high schools and universities throughout the United States. These groups perform a theme-based show in competitions after the outdoor marching band season ends. Indoor color guard shows are typically performed in school gymnasiums and are adjudicated. High step is a style of marching used by many colleges and universities, including most bands of HBCUs and the Big Ten. Three primary sub-variants of the high are used: The ankle-knee step involves bringing the foot up to the inside of the leg to the knee before coming down and forward. This is the style used by most bands from HBCUs. The chair step involves lifting the knee until the thighs are parallel to the ground, and with toes pointed downward. When the leg is elevated to its maximum height, a ninety-degree angle exists between the torso and the thigh, as well as between the thigh and shin. The leg is then lowered, and this is repeated in an alternating fashion between the legs. The style is used by many schools in the Big Ten. The extended high step, similarly to the chair step, involves the thigh being parallel to the ground and perpendicular to the body, but instead with the shin extended outward at a forty five-degree angle from the body and with toes pointed downward. The leg is then driven quickly back to the ground while the other leg repeats in this fashion. An integral part of this style of marching is known as stop action, meaning that all movement ceases momentarily at the apex of each step. This requires a band to have a great deal of stamina, though is effective visually. High step marching is often accompanied by a horizontal swing of the player's body and/or instrument. CANNOTANSWER
Question: What is high step?. Whats the answer?

HBCU bands utilize the traditional "ankle-knee" high step and music selections are largely based on R&B, hip-hop, and contemporary popular music.