Lee Lewis, Roy Orbison, and Charlie Rich began their recording careers, and where rock and roll took shape in the 1950s. Stax Records in Memphis became one of the most important labels for soul artists in the late 1950s and 1960s, and a subgenre known as Memphis soul emerged. The 1927 Victor recording sessions in Bristol generally mark the beginning of the country music genre and the rise of the Grand Ole Opry in the 1930s helped make Nashville the center of the country music recording industry. Nashville became known as "Music City", and the Grand Ole Opry remains the nation's longest-running radio show. Many museums and historic sites recognize Tennessee's role in nurturing various forms of popular music, including Sun Studio, Memphis Rock N' Soul Museum, Stax Museum of American Soul Music, and Blues Hall of Fame in Memphis, the Ryman Auditorium, Country Music Hall of Fame and Museum, Musicians Hall of Fame and Museum, National Museum of African American Music, and Music Row in Nashville, the International Rock-A-Billy Museum in Jackson, the Mountain Music Museum in Kingsport, and the Birthplace of Country Music Museum in Bristol. The Rockabilly Hall of Fame, an online site recognizing the development of rockabilly, is also based in Nashville. Several annual music festivals take place throughout the state, the largest of which are the Beale Street Music Festival in Memphis, the CMA Music Festival in Nashville, Bonnaroo in Manchester, and Riverbend in Chattanooga. Education Education in Tennessee is administered by the Tennessee Department of Education. The state Board of Education has 11 members: one from each Congressional district, a student member, and the executive director of the Tennessee Higher Education Commission (THEC), who serves as ex-officio nonvoting member. Public primary and secondary education systems are operated by county, city, or special school districts to provide education at the local level, and operate under the direction of the Tennessee Department of Education. The state also has many private schools. The state enrolls approximately 1 million K–12 students in 137 districts. In 2021, the four-year high school graduation rate was 88.7%, a decrease of 1.2% from the previous year. According to the most recent data, Tennessee spends $9,544 per student, the 8th lowest in the nation. Colleges and universities Public higher education is overseen by the Tennessee Higher Education Commission (THEC), which provides guidance to the state's two public university systems. The University of Tennessee