The use of Cells is a popular musical composing technique for minimalist composers (as well as some experimental composers). The idea is that instead of using bars, composers use cells. These cells are repeated throughout a piece of music to create different textures, melodies and rhythms. The most famous piece of music that uses cells is called “In C” by Terry Riley. In this piece Riley uses a number of cells and instructs the performers to repeat them as many times as they want to before moving on to the next cell

Here is a performance of “In C”