Final answer:
Twentieth-century composers were drawn to the unconventional rhythms and sounds of folk and popular music, which resonated with a broader audience and allowed for a more distinct musical language. The aim to express national identity and the need to cater to the growing middle class influenced the integration of these musical elements, resulting in a more relatable and sometimes commercially viable body of work.
Step-by-step explanation:
Twentieth-century composers incorporated elements of folk and popular music within their personal styles for several reasons. One major factor was the attraction to unconventional rhythms, sounds, and melodic patterns that folk and popular music provided. These elements offered fresh inspiration and helped composers to create a distinct, often more accessible, musical language.
Another important aspect was the social and cultural environment. The rise of the middle class and increasing public concerts meant composers were writing for a broader audience. This shift encouraged the inclusion of folk music elements that were familiar and appealing to the masses, making the music more relatable and, in some cases, more commercially viable. Moreover, composers wanted to express their national identity and cultural heritage through music, leading to the creation of works with a strong nationalistic character.
Collectively, these influences resulted in a significant trend within modern music. Composers like Berlioz, Strauss, and Wagner were known for pushing boundaries and integrating these diverse elements, leading to the rich and varied tapestry of twentieth-century music.