Final answer:
Memphis, Tennessee was the focal point in the Southeast for recording blues, also known for its significant role in the development of rock n' roll with artists like Elvis Presley recording for Sun Records.
Step-by-step explanation:
The focal point in the Southeast for recording blues was Memphis, Tennessee. During the 1920s, although jazz had its home in Harlem, Memphis emerged as a crossroads location, fostering a rich musical scene. This city, influenced by various musical traditions including blues from the Mississippi Delta, bluegrass, and gospel, became a melting pot for musical innovation. Memphis is especially notable for its role in the evolution of rock n' roll music, where artists like Elvis Presley, Carl Perkins, Johnny Cash, and Jerry Lee Lewis got their start and recorded for Sun Records. Geography and the unique cultural mix of the Memphis area played a crucial role in allowing these music genres to flourish, particularly in the interaction and fusion of musical styles between blacks and whites.