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Finally, the exploration concludes in the 20th Century, a time marked by diversification and innovation. This era can be segmented into numerous styles and movements; however, a common thread is the departure from strict compositional guidelines seen in previous years. The radio, television, and cellphone revolutionized access to music, ensuring that it reached a wider audience than ever before. The creation of the musical and ongoing experimentation in various aspects of music have defined the 20th century, suggesting that music will continue to evolve with society.