People who perform composition are called composers. Useful skills in composition include writing musical notation, instrumentation, and handling musical ensembles. The definition of composition has broadened to include extensive techniques such as improvisation, musical montage, preparing instruments, using non-traditional objects or methods of sound production, and make music from silence, as John Cage famously did.
Compositional techniques are the methods used to create music. In discussing the structure or association of a musical work, the "composition" of that work is generally called its musical form. These techniques draw a parallel to art's formal elements. Sometimes, the entire form of a piece is through-composed, meaning that each part is different, with no repetition of sections; other forms include strophic, rondo, verse-chorus, etc. Some pieces are composed around a set scale, where the compositional technique might be measured the usage of a particular scale. Others are composed during performance; techniques are sometimes used, however, in this case also.