Thank you Peachey~What a useful website!

It is possible, but I agree with MK7 - it's a poorly-written sentence, and the actual meaning of "such as it was" is not right in this example. Have a look here: http://dictionary.cambridge.org/dictionary/english/such-as-it-is

The English is not good writing. It would be much better to say: "British pop music, in the fifties and early sixties, was also London-centred, with a prejudice against provincial towns and cities.” In this case, the phrase "such as it was" adds nothing; indeed it's confusing, and it's really quite ugly. An editor wouldn't think twice about striking it.