T. Rex were an English rock band fronted by guitarist, singer and songwriter Marc Bolan. Formed as Tyrannosaurus Rex in 1960s London, the folk rock group's debut album, the oddly-titled My People Were Fair and Had Sky in Their Hair... but Now They're Content to Wear Stars on Their Brows (1968) did reach #15 in the UK.
In the 1970s, they achieved mainstream success as they morphed into a glam rock band -which (friend-of-Bowie) Bolan preferred to refer as Cosmic Rock- with the hits 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 disbanded in 1977 when Bolan was tragically killed in a car accident.
This modern montage video for Get It On (Bang a Gong) comes from Japan, and is a little weird... but with HD sound quality.
Telegram Sam below is a favorite of mine, with stylized Chuck Berry riffs, a primary element of the T-Rex sound I remember hearing on AM radio when I was ten. It was with Sweet and all the other poppy early 70s bands like Rasberries that introduced me to rock n roll music on my little Philco transistor radio... and on K-Tel records:
T-Rex: Get It On- 1971
T-Rex: Telegram Sam- 1972