Which U.S. city is famously known as the birthplace of rock and roll?

Cleveland is famously known as the birthplace of rock and roll due to its historical significance and cultural contributions to the genre. The city gained this reputation primarily because of the influential radio DJ Alan Freed, who popularized the term "rock and roll" in the early 1950s. Freed's radio show, which aired from Cleveland, helped introduce many early rock and roll artists to a wider audience, thereby establishing the city as a pivotal location in the development of this music style. Additionally, Cleveland is home to the Rock and Roll Hall of Fame, which further solidifies its status in the history of rock and roll music.

While Nashville, Chicago, and Detroit have their own rich musical heritages, particularly with country, blues, and Motown respectively, they are not specifically credited with the title of rock and roll's birthplace in the same way that Cleveland is.