There were a lot of very different bands peddling their wares in the progressive rock 'golden age' of the 1970s - some tending toward symphonic grandeur, other towards jazz fusion, and others still ploughing the more immediate end of the spectrum. There were the left-field eccentrics and the tricky 'difficult' bands. Apart from it all, however, there were Van Der Graaf Generator. In a decade stuffed with a wild array of influences, styles and instrumental...