Which composer is known for their work with the mass in the 20th century?

The composer known for significant contributions to the mass in the 20th century is Stravinsky. His work reflects a modern approach to traditional liturgical music, notably with compositions such as "Mass," which showcases his innovative style while incorporating elements of classic traditions. Stravinsky’s exploration of rhythm, harmony, and instrumentation offered a fresh perspective on the mass form, distinguishing his contributions from those of composers focused primarily on earlier periods.

Fauré, while influential in the realm of choral music, is associated with compositions that are more Romantic than 20th-century in style. Machaut is a key figure from the medieval era, and his works precede the 20th century by several centuries. Smetana is celebrated for his operas and symphonic works, particularly representing the Czech nationalist movement in the 19th century, and does not have a primary major focus on the mass in the 20th century. These distinctions clarify why Stravinsky is the appropriate choice in the context of modern mass compositions.