The latest and greatest idea that is being packaged and fed to prospective teachers is the idea of the "new vision." This new vision is based on the idea that the lecture that historically has taken place in most classrooms is not just inefficient but harmful to kids. The new vision involves changing the delivery system of your chosen content (science, math, art, basket-weaving 101, whatever) to fit the kids that are in your classroom. This always means, based on studies I haven't yet gotten a glimpse of yet, differentiated, cooperative learning. This means allowing your students to learn by themselves with a teacher being a guide. The students actively seek answers to problems in small groups, mediated by a teacher. The idea makes the shifts the paradigm from a teacher-centered classroom (a lecture) to a student-centered classroom (an interactive breeding ground for the development and exchange of ideas).
In a way, a band is already similar to the new vision, because band does not usually involve a lecture. Music class is more like a lab: students are actively participating in music. That is the way it should be. There are times when a lecture on music history would be appropriate, but no musician thrives on music history and theory alone. The act of making music is what is approached first and foremost. Even musicologists, who make their living primarily as music critics, music columnists, or researchers, play an instrument, because music can't be understood by lecture alone. Thankfully, this is understood by the members of the school administration. They understand that they cannot expect a music teacher to have a band that can successfully play in the stands at a game with a music lecture on music theory, history or even applied music. When people think of a music class, they already expect to see a rehearsal where kids are involved, each equipped with an instrument of some kind, or their voice.
The aspect that does not work is splitting the class up into small groups. In the music world, we would refer to the small groups as
chamber ensembles. However, splitting the kids up into groups is more involved than splitting a science class into groups. There are two factors that govern which the students have to grouped together. The first consideration is their instrument. They must be put into trios or quartets according to what music already exists for that combination of instruments. Western classical music already has a long tradition of which combinations of musical instruments work in a trio or quartet. For example, there is little repertoire for a clarinet, a trombone, and a drum set. This is an ineffective ensemble to compose music for because the combination of sounds is not pleasing. So, if your second period band has six trumpets, two flutes, a tuba, and a saxophone, you probably won't find quality literature for these groups to play. If you were to settle for less quality literature, the kids don't get an enriched musical experience. The second factor to consider is musical ability. Generally, mixing levels of ability is not acceptable like it is in a math class. For example, four members of the woodwind quintet: the horn player, the oboe player, the bassoon player, and the flute player have all had previous piano training and private lessons on their individual instruments. The clarinet player, on the other hand, has not. She has only been playing for three years and her sense of pitch is less than perfect. When you select literature for the group, you can't expect that the more experienced players will "help" the less experienced clarinet player along. It doesn't work that way. It takes years of experience to improve. So, the whole ensemble is frustrated: the four players are frustrated with the clarinet player who plays out of tune and can't stop slowing down the tempo, and the clarinet player struggles with music that is too hard for her to feel like she can be successful at it. It is just a messy scenario.
It is also easier for students in an academic classroom to divide into small groups in the same room. With music, band kids are noisy. They play loud and noisy instruments, and when you put them together in groups, they can only hear their own group if they are isolated into their own practice space. All the chamber ensembles rehearsing in the band room does not work very well.
In light of the new vision, I think that kids can make musical progress when they are playing as a whole unit, instead of being split into chamber groups. Chamber music is a wonderful for the development of fine musical skills thanks to its intimate and soloistic nature. But choosing chamber music as the way or executing the new vision is not practical or possible in most cases. Even schools that have all the players needed for a full wind ensemble can't evenly divide the scoring and instrument numbers into standard Western trios and quartets for which repertoire exists. The best way the new vision can be implemented in a music classroom is to keep the large ensemble as a whole and run weekly sectionals, where all the same instruments (trumpets in one group, saxophones in another, etc.) rehearse their parts together.