Daryl Hall is a singer-songwriter who's part of the mega-hit duo Hall & Oates, known for hit songs like "Sara Smile," "One on One" and "Out of Touch."

Jim James is a singer, songwriter, guitarist and founding member of the psychedelic rock band My Morning Jacket. Under the name Yim Yames, he created his first solo album, Tribute To, to honor the music of George Harrison.

In 1981, punk rock musician Billy Idol launched his solo career with the release of Don't Stop, then formed a new band that released four successful records.

R. Kelly is a popular American R&B singer-songwriter and record producer best known for his gospel-tinged vocals and highly sexualized lyrics.

Brittany Howard is the lead singer for the popular rock group Alabama Shakes.

Sam Cooke, commonly known as the King of Soul, was an African-American gospel, R&B, soul, and pop singer and songwriter. He had 29 top-40 hits from 1957-1964.

John Lennon, pop star, composer, songwriter and recording artist, founded the Beatles, a band that impacted the music scene like no other before or since.

Vince Gill is an award-winning country musician known for such hits as 'What the Cowgirls Do' and 'Whenever You Come Around.'

Little Richard is a flamboyant American singer and pianist whose hit songs in the mid 1950s were defining moments in the development of rock ‘n’ roll.

Chuck Berry was one of the most popular and influential performers of rhythm-and-blues and rock 'n' roll music during the 1950s, '60s and '70s. He's known for songs like "Johnny B. Goode" and "My Ding-a-Ling."

Curtis Mayfield was a singer-songwiter known for his racially conscious soul and funk who had a number one album with his score for the film Superfly.

Doc Watson was a blind American guitarist/singer and folk music pioneer whose unprecedented flat-picking style and interpretations of traditional American songs influenced generations of musicians.

Arlen Specter was Philadelphia District Attorney and was elected to the senate five times. He helped initiate the reauthorization of the Patriot Act.

John F. Kennedy, the 35th U.S. president, negotiated the Nuclear Test-Ban Treaty and initiated the Alliance for Progress. He was assassinated in 1963.

Barack Obama is the 44th and current president of the United States, and the first African American to serve as U.S. president. First elected to the presidency in 2008, he won a second term in 2012.

Michelle Obama is a lawyer, Chicago city administrator and community outreach worker, as well as the wife of U.S. President Barack Obama and the 44th first lady.