@mvuent
the point is not rejecting previous musical achievements, the point is that you can't subscribe to scruton's musical worldview without his politics. that's what Ben Watson is exactly criticising. that Scruton's music taste is not just structurally but politically conservative. it won't budge. for it to budge, one has to be interested (at least somewhat sympathetically, in black liberation, anti-art, situationism, modernism, stream of consciousness) etc.
It's truncated precisely because it tries to map the 19th century onto the 20th C, but with backdated assumptions gleaned from the french counter-revolution.
Another way to think about this is, Billy Bragg is closer to Scruton than Coltrane, even though they have diametrically opposite views. Both lack a concept of the true universal. because the central tenet of marx (though not marxism generally) is that no worker wants to be a worker.