1945-present - An increasingly eclectic array of styles
In this period we find the development of classical and modern music as we see it today.
Influences and developments include the use of jazz and blues idioms in classical music (Darius Milhaud, George Gershwin), and the emergence of a style of contemporary classical music that also has wide popular appeal (Gerschwin, Aaron Copeland, Leonard Bernstein, Benjamin Britain).
Compositional techniques have expanded to utilize new technologies: for example, pieces composed to be played on computers, or choral pieces accompanied both by traditional instruments and sounds on an audio tape.
"Minimalism" is style that incorporates repeating tonal and rhythmic patterns that evolve slowly though the course of the piece. And there is a thriving subset of classical composition in the writing of soundtracks for motion pictures.