[Machine Translation] [MCA Gems Series] A series planned and supervised by Nakamura Toyoshi, an authority on popular music research, from a wealth of sound sources including Decca, Coral, Vacarion, Chess, Peacock, Dot, Impulse, and many others, from his own unique perspective! This groundbreaking compilation captures the development of the blues in a composite form, and has been long awaited for a CD release since its LP release in 1975.