Yeah, but there's a lot of bands IOTL that don't declare themselves far right but they are, and everyone knows that so nobody other than a few fringe folks listens to them.
I'd imagine anarchist, socialist, and commie bands ITTL would be similar, like how a lot of far right bands (let's take metal as an example, as it is a genre unfortunately on occasion tainted by their presence) for example declare themselves to just be a metal band, sometimes folk metal. If they declare a political leaning, it will tend to be conservative or, if they're feeling particularly brave or stupid, nationalist.
Similarly, ITTL, leftist musicians may refer to themselves by genre rather than political leaning, or use something like liberal or progressive so as not to openly admit to being far left, however they will likely still be viewed negatively because being politically extreme tends to be hard to hide.
en.wikipedia.org
