a standardization of a cappella performance through the founding of CASA. One of CASA's core values in its promotion of the a cappella community is that of innovation, stating “We develop new methods for singers, groups, fans, and educators to sing, learn, connect, and interact with one another.” The new style used voices to emulate modern rock instruments, marking a shift away from the more traditional sounds of jazz or classical ensembles and glee clubs to contemporary a cappella, with groups focusing on modern pop music, complete with complex textures and a driving beat (see vocal percussion). Today, even some glee clubs have a largely pop-music repertoire supplemented only in small part by the traditional genres. In modern competing A Cappella groups, there are several techniques that are making each group more and more distinctive. Beatboxing is at the top among them, but tone, sound effects, style, blend, and harmonies are all unique, too. Performance styles Collegiate a cappella spans many music genres and styles including alternative and hard rock, comedy, Jewish (including mostly Yiddish or Hebrew songs), Christian (including Christian pop and rearranged hymns), South Asian fusion (mainly composed of youth of South Asian origin or heritage), jazz-influenced pop, fusion, barbershop, Rhythm and Blues, madrigals, and jazz. Differences in musical styles and individual group preferences result in a great diversity of music arrangements and performances. Costume The costumes, and uniforms that the groups display, present a message to the audience. That may be in matching, not matching, formal, informal, and many more. Each group has a "brand" and a "look/style" to their members. Costumes can be whatever a group wants them to be, but aesthetic appearances is a pleasing visual for the audience and, most importantly, the judges. Choreography Within the ICCAs and ICHSAs is a point system. Each groups is judged based on several things, some of which including sound, blend, harmonies, costume, choreography, and many more. Choreography is a big factor in determining how many points a group will get, and how clean and precise their movements are, is also vital. Arch sing An "arch sing" is a casual, public performance, often held in an archway for reasons of acoustics and shelter from the weather. Typically, one or more a cappella groups will perform for a small audience, either as a concert or to promote upcoming concerts. The term is also sometimes used to describe similar casual,