Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s, primarily from a combination of African American blues, country, jazz, and gospel music. Though elements of rock and roll can be heard in country records of the 1930s, and in blues records from the 1920s, rock and roll did not acquire its name until the 1950s.

The term "rock and roll" now has at least two different meanings, both in common usage. The American Heritage Dictionary and the Merriam-Webster Dictionary both define rock and roll as synonymous with rock music. Encyclopædia Britannica, on the other hand, regards it as the music that originated in the mid-1950s and later developed "into the more encompassing international style known as rock music". For the purpose of differentiation, this article uses the second definition.

In the earliest rock and roll styles of the late 1940s and early 1950s, either the piano or saxophone was often the lead instrument, but these were generally replaced or supplemented by guitar in the middle to late 1950s. The beat is essentially a blues rhythm with an accentuated backbeat, the latter almost always provided by a snare drum. Classic rock and roll is usually played with one or two electric guitars (one lead, one rhythm), a string bass or (after the mid-1950s) an electric bass guitar, and a drum kit.

Avril Ramona Lavigne (pronunciation: /ˈævrɨl ləˈviːn/; AV-ril lə-VEEN; born 27 September 1984) is a Canadian singer-songwriter. She was born in Belleville, Ontario, but spent most of her youth in the small town of Napanee. By the age of 15, she had appeared on stage with Shania Twain; by 16, she had signed a two-album recording contract with Arista Records worth more than $2 million. In 2002, when she was 17 years old, Lavigne broke onto the music scene with her debut album Let Go.

Let Go made Lavigne the youngest female soloist to reach No. 1 in the UK, and the album was certified four-times platinum by the Recording Industry Association of America. By 2009, over 16 million copies had been sold worldwide. Her breakthrough single, "Complicated", peaked at No. 1 in many countries around the world, as did the album Let Go. Her second album, Under My Skin, was released in 2004 and was her first album to peak at No. 1 on the U.S. Billboard 200, eventually selling more than 10 million copies worldwide. The Best Damn Thing, Lavigne’s third album, was released in 2007, becoming her third No. 1 album in the UK Albums Chart and featuring her first U.S. Billboard Hot 100 No. 1 single, "Girlfriend". Lavigne has scored six number-one singles worldwide, including "Complicated", "Sk8er Boi", "I'm with You", "My Happy Ending", "Nobody's Home", and "Girlfriend". With more than 30 million copies of her albums sold worldwide, Lavigne is one of the top-selling artists releasing albums in the U.S., with over 10.25 million copies certified by the RIAA. Her fourth studio album, Goodbye Lullaby, was released in March 2011. Goodbye Lullaby gave Lavigne her fourth top 10 album on the U.S. Billboard 200 and the UK Albums Chart and her third No. 1 album in both Japan and Australia. Three months after the release of Goodbye Lullaby, Lavigne began work on her fifth album, which will be released on Epic Records following her departure from RCA Records.

Thomas Earl "Tom" Petty (born October 20, 1950) is an American singer-songwriter and multi-instrumentalist. He is the frontman of Tom Petty and the Heartbreakers and was a founding member of the late 1980s supergroup Traveling Wilburys and Mudcrutch. He has also performed under the pseudonyms of Charlie T. Wilbury, Jr. and Muddy Wilbury.

He has recorded a number of hit singles with the Heartbreakers and as a solo artist, many of which remain heavily played on adult contemporary and classic rock radio. His music, and notably his hits, have become popular among younger generations as he continues to host sold-out shows. Throughout his career, Petty and his collaborators have sold 60 million albums.

Tom Petty was born and raised in Gainesville, Florida, and attended Gainesville High School. His interest in rock and roll music began at age 10 when he met Elvis Presley. In the summer of 1961, his uncle was working on the set of Presley's film Follow That Dream in nearby Ocala, Florida and invited Petty to come down and watch the shoot. He instantly became an Elvis Presley fan and soon traded his Wham-O slingshot for a box of Elvis 45s. In a 2006 interview on the National Public Radio program Fresh Air, Petty said that he knew he wanted to be in a band the moment he saw The Beatles on The Ed Sullivan Show. One of his first guitar teachers was Don Felder, a fellow Gainesville resident, who would later join the Eagles. As a young man, Petty worked briefly on the grounds crew for the University of Florida, but never attended as a student. An Ogeechee lime tree that he planted while employed at the University is now called the Tom Petty tree.

Jeffrey "Jeff" Lynne (born 30 December 1947) is an English songwriter, composer, arranger, singer, multi-instrumentalist, and record producer who gained fame as the leader and sole constant member of Electric Light Orchestra. He was later a co-founder and member of The Traveling Wilburys together with George Harrison, Bob Dylan, Roy Orbison, and Tom Petty. Lynne has produced recordings for artists such as The Beatles, Brian Wilson, Roy Orbison, Dave Edmunds, Del Shannon and Tom Petty. He has co-written songs with Petty and also with George Harrison, whose 1987 album Cloud Nine was co-produced by Lynne and Harrison. Among the many compositions to his credit are such well-known hits as "Livin' Thing", "Evil Woman", "Turn to Stone", "Do Ya", "Xanadu", "Strange Magic", "Sweet Talkin' Woman", "Telephone Line", "Shine a Little Love", "Mr. Blue Sky", "Hold On Tight", "All Over the World", and "Don't Bring Me Down".

In 2008, The Washington Times named Lynne the fourth greatest record producer in music history.

George Harrison,MBE (25 February 1943 – 29 November 2001) was an English musician and singer-songwriter who achieved international fame as lead guitarist of The Beatles. Often referred to as "the quiet Beatle", Harrison became over time an admirer of Indian culture and mysticism, and introduced it to the other Beatles, as well as their Western audience. Following the band's break-up he was a successful solo artist, and later a founding member of the Traveling Wilburys. Harrison was also a session musician and a film and record producer. He is listed at number 11 in Rolling Stone magazine's list of "100 Greatest Guitarists of All Time".

Although most of The Beatles' songs were written by Lennon and McCartney, Beatle albums generally included one or two of Harrison's own songs, from With The Beatles onwards. His later compositions with The Beatles include "Here Comes the Sun", "Something" and "While My Guitar Gently Weeps". By the time of the band's break-up, Harrison had accumulated a backlog of material, which he then released as the triple album All Things Must Pass in 1970, from which two hit singles originated: a double A-side single, "My Sweet Lord" backed with "Isn't It a Pity", and "What Is Life". In addition to his solo work, Harrison co-wrote two hits for former Beatle Ringo Starr, as well as songs for the Traveling Wilburys—the supergroup he formed in 1988 with Jeff Lynne, Bob Dylan, Tom Petty, and Roy Orbison.