Wikipedia lists some important premieres in art music from 1926, which I would not have guessed were all written so close together:

Puccini: Turandot
Varese: Ameriques
Sibelius: Tapiola
Janacek: Sinfonietta, The Makropoulos Case
Bartok: The Miraculous Mandarin, Piano Concerto no. 1
Falla: Harpsichord Concerto

Living musicians born in the same year: Gyorgy Kurtag and Tony Bennett.

It's a somewhat ghoulish coincidence that both The Makropoulos Case and The Miraculous Mandarin are about immortality considered as a pathological burden.