World War II affected music in Japan, through the National Mobilization Law of 1938.

One of the effects of the law was to allow the government to assert control of music, banning western music and instruments, including the electric guitar, banjo and ukulele.

He continued the work of promoting the mandolin and guitar, giving a concert with his orchestra November 6, 1949.

After Takei's death, the Orquestra Sinfonica Takei (OST) was dissolved in December 1958, but then started up again in December 1959 under the name Murao Sugita Symphony Orchestra.

In May 1987 it was renamed Orquestra Sinfonica Tokyo (OST), which it remains today.