T. Rex were a British rock band fronted by guitarist, singer and songwriter Marc Bolan. Formed as Tyrannosaurus Rex in 1960s London, the folk rock group's debut album My People Were Fair and Had Sky in Their Hair... But Now They're Content to Wear Stars on Their Brows (1968) reached number 15 in the UK.

In the 1970s, they achieved mainstream success as a glam rock band with the hits "Jeepster", "Get It On", "Ride a White Swan", "20th Century Boy", "Children of the Revolution", "Hot Love", "Telegram Sam" and "Metal Guru". After waning commercial success in the mid-70s, T. Rex ended in 1977 after Bolan was killed in a car accident.

T. Rex have vastly influenced the glam rock, punk rock and Britpop genres. Many modern indie bands play music heavily influenced by the glam scene. The Who specifically referenced T. Rex in the lyrics of their 1981 song You Better You Bet.

The early acoustic material was influential in helping to bring about progressive rock and 21st century folk music-influenced singers.
"Get It On" is a song featured on their 1971 album Electric Warrior. Written by Marc Bolan, "Get It On" was the second chart-topper for T. Rex on the UK Singles Chart.

In the United States, the song was retitled "Bang a Gong (Get It On)" to avoid confusion with a number of the same name by the group Chase. It is arguably T. Rex's best-known song.

While it only spent four weeks at the top in the UK, starting 24 July 1971 ("Hot Love" was number one for six weeks from March to May), it was the group's biggest hit overall, selling nearly a million copies in the UK.

It peaked on the U.S. Billboard Pop Singles chart at number ten in January 1972, becoming the band's only major U.S. hit. In March 2005, Q magazine placed "Get It On" at number 36 in its list of the 100 Greatest Guitar Tracks.