Final answer:
The session musicians from Stax Records in Memphis were informally known as The Swampers. They were pivotal in creating the Southern soul sound during a time when Memphis was a hub for various merging musical influences.
Step-by-step explanation:
The informal name of the session musicians who played on all of the recorded music coming from Stax Records in Memphis is The Swampers. This group of talented musicians were foundational to the development of the distinctive Southern soul sound that characterized Stax recordings. Memphis was a melting pot of musical styles, providing a rich environment that influenced musicians from the area. Celebrated figures like Chuck Berry and Elvis Presley drew inspiration from a variety of regional musical traditions, crafting groundbreaking sounds that resonated with a wide audience. The Swampers, although associated primarily with Stax Records, played a significant role in shaping the sound of Southern soul music during this vibrant cultural period.