OF THE MERE six dates Hawkwind had chosen for their American debut tour, it seemed most appropriate to be seeing them in Detroit, the ancestral home of heavy metal and the final resting place of the counter-cultural revolution. Hawkwind, the last of the great psychedelic freakout bands, knew what they were doing when they turned down other gigs in order to appear in Detroit. And the scruffy, vacant-eyed kids who filled the hall, some of whom had come hundreds of miles, seemed to know what was in store for them.