 This line up headlined the very first Glastonbury Festival in 1970.As well as progressively shorter titles, Tyrannosaurus Rex's albums began to show higher production values, more accessible songwriting from Bolan, and experimentation with electric guitars and a true rock sound.A breakthrough had been "King of the Rumbling Spires" (recorded with Took and released in summer 1969 shortly prior to his departure), which used a full rock band setup, and the electric sound had been further explored on "A Beard of Stars".