Dmitri Shostakovich, a prominent Soviet composer (1906-1975), composed 15 symphonies reflecting the turbulent political and social changes in the Soviet Union. His works are renowned for their emotional depth, technical complexity, and political commentary, making him one of the most influential 20th-century composers.

20th century saw significant music tech advancements, including phonograph, radio, and electronic instruments, which enabled recording, broadcasting, and manipulation of music, transforming its production, distribution, and consumption, leading to new genres and styles.

George Gershwin was an American composer who fused classical and jazz music in the 20th century. He is known for his iconic works that blended these two genres, creating a unique and influential musical style.

Béla Bartók was a Hungarian composer, pianist, and ethnomusicologist who made significant contributions to the study and preservation of folk music in the 20th century. His research on the folk music of Eastern Europe, particularly Hungary, Romania, and Slovakia, had a profound impact on the development of modern music.

20th century saw evolution of popular music genres, including rock, pop, hip-hop, and electronic. Influential artists, new recording tech, and globalization shaped diverse musical landscape.

The 20th century saw a significant impact of the internet on music distribution, revolutionizing access, sharing, and consumption, leading to a fundamental shift in the industry, with the emergence of digital platforms and streaming services.

20th century saw development of atonal music, departing from traditional tonal system. Composers like Schoenberg, Berg, and Webern pioneered this new style, rejecting central key or tonal center. This led to exploration of more dissonant and experimental forms of musical expression, challenging conventions and paving way for diverse styles.

Aaron Copland was a prominent American composer of the 20th century. His works, such as "Appalachian Spring" and "Rodeo," are considered quintessential American classical music, capturing the spirit and landscape of the United States.

Benjamin Britten was a renowned 20th-century English composer known for his operas. He composed a diverse range of works, including orchestral pieces, chamber music, and vocal works. Britten's operas, such as "Peter Grimes" and "Billy Budd," are considered among the most significant contributions to the genre in the 20th century.

The 20th century saw the rise of electronic music, which transformed music composition, performance, and experience through the use of synthesizers, samplers, and digital recording. This technological revolution led to the emergence of new genres, including electronic, ambient, and dance music, and influenced composers and musicians across styles.

Igor Stravinsky was a renowned 20th-century Russian composer who made significant contributions to the development of modern music. His innovative and avant-garde compositions, spanning ballet, opera, and orchestral works, were highly influential in shaping 20th-century music.

20th century music saw significant changes due to World Wars I and II, leading to the displacement of musicians and the emergence of new styles and genres. The disruption of traditional practices, new technologies, and cultural cross-pollination all shaped the diverse musical landscape. (48 characters)

The 20th century saw a significant growth in the music industry, particularly with the advent of digital music formats. During this period, the music landscape underwent a major transformation, with the emergence of new technologies and the increasing accessibility of music to a wider audience.

20th century saw film music emerge as distinct art form. Composers created original scores for movies, enhancing emotional impact and narrative. (45 characters)

20th century saw evolution of hip-hop and rap music, emerging from African-American communities in 1970s. Genres evolved from earlier forms of African-American music, incorporating elements of spoken word, turntablism, and sampling. Over the century, hip-hop and rap developed into diverse and influential musical styles, reflecting experiences and perspectives of marginalized communities.

Schoenberg's 12-tone technique was a revolutionary approach to musical composition in the early 20th century. It abandoned traditional tonality and used a series of 12 notes, each used once before repeating. This technique was a significant departure from common practice and paved the way for atonal and serial music.

20th century saw transformation in music with rise of genres and new technologies. MTV, launched in 1981, revolutionized music consumption and promotion through music videos, shaping visual representation and marketing of artists, and influencing popular culture and fashion.

Here is a 45-character summary of the given introduction: The 20th century saw the rise of rock and roll, a genre heavily influenced by blues, R&B, and country, characterized by a driving beat, electric guitars, and youth culture.

The influence of jazz on classical music in the 20th century was significant. Composers blended jazz and classical elements, creating a unique and influential musical style.

Serialism is a 20th-century compositional technique that systematically organizes pitch, rhythm, and other elements using a predetermined series or "row" of notes. Pioneered by Schoenberg, Berg, and Webern, it significantly impacted classical and avant-garde music.