High Quality Content by WIKIPEDIA articles! Space rock is a subgenre of rock music; the term originally referred to a group of early, mostly British 1970s progressive rock and psychedelic, bands such as Hawkwind and Pink Floyd, characterised by slow, lengthy instrumental passages dominated by synthesizers, experimental guitar work and science fiction lyrical themes, though it was later repurposed to refer to a series of late 1980s British alternative rock bands that drew from earlier influences to create a more melodic but still ambient form of pop music. The term was revived in the 21st century to refer to a new crop of bands including the Flowers Of Hell, Comets On Fire, and Flotation Toy Warning who diversely draw upon the ideas and sounds of both waves of the genre?s founders.