Minimal music is a composition style that became popular around 1980. Its main characteristic is the use of short musical ideas that are repeated very often, and then slightly changed during the composition.
It is sometimes hard to tell when to call a composer modern, as opposed to Romantic. In general you can say that the Moder Eara in music started around the year 1900. However, many composers continued to write pieces in a romantic fashion long after that.
Composers who also play percussion instruments and as such performed their own or other composer's compositions.