Final answer:
Country bars in the southern United States gave birth to Blues music, which featured an up-ten beat with improvised solos.
Step-by-step explanation:
The bars in the southern United States that gave birth to Blues music were 3) Country bars. The musical styles that developed among blacks in the South, including the Blues, were a product of inherited musical traditions, locally available instruments, and the living conditions forced upon them. The Blues featured an up-ten beat with improvised solos, bound together by a bolder rhythm and harmony.