Final answer:
The first hit song by the first rock star, "That's All Right" by Elvis Presley, was recorded in Memphis, Tennessee, at Sun Records in 1954. This city's diverse musical influences and its promotion of interaction among musicians of different races played a pivotal role in the birth of rock and roll.
Step-by-step explanation:
The city where the first hit song by the first rock star was recorded is Memphis, Tennessee. Elvis Presley, often referred to as the first true rock and roll star, recorded his first hit song, "That's All Right," at Sun Records in Memphis in 1954. This city, at the crossroads of different musical influences such as blues, gospel, country, and western, allowed for a fusion of styles that gave birth to rock and roll music. Presley utilized these elements to create groundbreaking records that catalyzed the popularity of rock music. Moreover, Memphis allowed for a greater amount of musical interaction between black and white musicians, fostering an environment ripe for the emergence of rock and roll.
Elvis Presley wasn't the only musician to benefit from the vibrant musical scene in Memphis; artists like Carl Perkins, Johnny Cash, and Jerry Lee Lewis also started their careers in the Memphis area, recording for Sun Records.