The source provides an extensive overview of the life and musical career of Marc Bolan, the English guitarist, singer-songwriter, and poet best known as the founder of T. Rex and a pioneer of the glam rock movement. It details his early life, including his birth name Mark Feld and his working-class London background, before tracing his music career from the mid-1960s, beginning with attempts to find success under names like Toby Tyler and as a member of John's Children. The text highlights his success with the psychedelic folk band Tyrannosaurus Rex and the massive popularity he achieved after shortening the name to T. Rex and embracing the electric glam rock sound, marked by seminal hits like "Hot Love" and "Get It On"