Just one or two composers have been suggested to represent each aesthetic school, although, in each category, there are many others. Some of these composers worked in more than one area. Xenakis’s music, for example, embraces gesture and sonic composition as well as microtonality; and Gubaidulina’s broad approach uses “the new tonality” and polystylicity in addition to gesture. As well as the composers mentioned, there are hundreds of other composers who work within a more conservative tradition, based on tonality or modality. Stravinsky, Prokofiev, Shostakovitch, and Messiaen are just four composers whose music has mass appeal, possibly because of their more traditional musical aesthetic.