Space rock is a style of music; the term originally referred to a group of early mostly British 1970s progressive rock and psychedelic bands like 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.