70. Which of the following is a composer whose musical scores often are arranged according to the laws of chance?

Answer: B

Explanation:

John Cage is a composer whose musical scores often are arranged according to the laws of chance.

John Cage is renowned for his innovative approach to music, particularly his use of chance operations in composition. This method involves allowing elements of randomness to determine aspects of a musical work, which is a hallmark of Cage's style.

A) Gustav Mahler

Gustav Mahler is known for his symphonic works that are meticulously crafted and emotionally profound, but he did not employ chance in his composition process. His structured approach contrasts sharply with the randomness characteristic of John Cage's works.

B) John Cage

John Cage is the correct answer as he is famous for integrating chance into his compositions. His groundbreaking works, such as "4'33"," exemplify how he challenged traditional notions of music by allowing chance to play a central role in the creation of sound.

C) Claude Debussy

Claude Debussy focused on impressionism in music, emphasizing atmosphere and texture rather than randomness. While he was innovative in his harmonic language, he did not utilize chance methods in his compositions like John Cage.

D) Johann Sebastian Bach

Johann Sebastian Bach is celebrated for his intricate and highly structured compositions, which are grounded in established musical forms and counterpoint. His works do not reflect the principles of chance that are fundamental to John Cage's approach.

E) Robert Schumann

Robert Schumann is known for his romantic compositions that express deep emotion and intricate structures. His music is carefully composed and does not involve the use of chance, distinguishing it from the works of John Cage.

Conclusion

John Cage's pioneering use of chance in music sets him apart as a unique figure in the world of composition. Unlike Mahler, Debussy, Bach, and Schumann, who adhered to more traditional and structured methods, Cage embraced randomness, fundamentally altering the landscape of contemporary music. This distinction confirms that B is the definitive answer.