"The Sound of Silence" is the song that propelled the 1960s folk music duo Simon & Garfunkel to popularity. It was written in February 1964 by Paul Simon in the aftermath of the 1963 assassination of John F. Kennedy. An initial version preferred by the band was remixed and sweetened, and has become known as "the quintessential folk rock release". In the U.S., it was the duo's second most popular hit after "Bridge Over Troubled Water".
The song features Simon on acoustic guitar and both singing. It was originally recorded as an acoustic piece for their first album Wednesday Morning, 3 A.M. in 1964 but on the initiative of the record company's producer, Tom Wilson, it was later overdubbed with drums (Bobby Gregg), electric bass (Bob Bushnell) and electric guitar (Al Gorgoni), all without the knowledge or participation of Simon & Garfunkel and rereleased as a single in September 1965.[3][4] The single reached number one on New Year's Day 1966 and was included in the 1966 album Sounds of Silence.
"The Sound of Silence" was originally called "The Sounds of Silence" and is titled that way on the early albums in which it appeared and on the first single release; only on later compilations was it retitled "The Sound of Silence". Both the singular and the plural appear in the lyrics. In his book Lyrics 1964–2008 Simon has the title in the singular.

Bridge Over Troubled Water is the fifth and final studio album by Simon & Garfunkel. Released on January 26, 1970 on both Quadraphonic and Stereo formats, it reached No. 1 on Billboard Music Charts pop albums list. It won a Grammy Award for Album of the Year, as well as for Best Engineered Recording, while its title track won the Grammy Award for Record of the Year and Song of the Year in the Grammy Awards of 1971. It has since sold over 25 million copies worldwide.

Sounds of Silence is an album by Simon and Garfunkel, released on January 17, 1966. The album's title is a slight modification of the title of the duo's first major hit, " The Sounds of Silence", which was released previously on the album Wednesday Morning, 3 A.M., and also on the soundtrack to the movie The Graduate. It was taken from their debut and electric instruments and drums were overdubbed by Bob Dylan's studio band on June 15, 1965 and released in September 1965 as a single. "Homeward Bound" was released on the album in the UK. It was also released as part of the box set Simon & Garfunkel Collected Works, on both LP and CD.