Yeah, that's right. Classes at Rock and Roll High School commence on Friday (and in the afternoon at that). That's just how this school rolls.

According to the Online Etymology Dictionary, the verbs rock ('to move back and forth') and roll have been used together in the phrase rock and roll (aka rock 'n' roll) since 1954 to refer to a specific style of music that is American in origin and has historically been associated with young listeners. However, the verbal phrase had been an African-American vernacular euphemism for "sexual intercourse," used in popular dance music lyrics and song titles since at least the 1930s. Furthermore, the words rock and roll had appeared together in song titles since at least 1922, with the recording and release of Trixie Smith's "My Man Rocks Me with One Steady Roll."

The term rock and roll has also appeared in the titles and lyrics of several songs in the Billboard year-end Top Ten collection (1951-2015). In chronological order, the first of these is "Rock and Roll Waltz" by Kay Starr, which was released in 1955.

Perhaps it is only appropriate that Starr would popularize a song in which two seemingly disparate elements -- rock and roll and the waltz -- would come together. Born July 21, 1922, Starr performed in jazz for many years before turning to pop music, and has since also recorded and performed in the genres of country and r&b. Early in her career, she won the respect of fans and musicians alike, with no less than the legendary Billie Holiday famously stating that Starr was "the only white woman that could sing the blues." Now 93 years old, Kay Starr still performs on occasion.

Other songs that include the term rock and roll include Rod Stewart's "Maggie May" (1971). Here he performs the song with the Faces on BBC's music program Top of the Pops.

The term was also used by Don McLean in his hit "American Pie" (also in 1971):

By Wild Cherry in "Play that Funky Music" (1976):

By Queen in "Crazy Little Thing Called Love" (1980):

By Billy Joel in "It's Still Rock and Roll to Me" (also 1980):

By Joan Jett and the Blackhearts in "I Love Rock 'n' Roll" (1981):

By The Black Eyed Peas in "Boom Boom Pow" (2009):

By LMFAO in "Party Rock Anthem" (2011):

And as a bonus, Led Zeppelin performing one of the great songs incorporating the phrase rock and roll: