The fact that the band exists and has a newspaper article about it is helpful. Otherwise it's article will be very short. So what?
> All of this applies equally well to little-known authors, random Indian corporations, and your cat.
Yes to the first two. (My cat has zero verifiable information about it.) They will have very tiny stub articles. So what?
> If all we have to go on is a couple of primary sources and maybe a passing mention in the press, what is there to say without giving undeserved credence to the primary sources?
So don't say anything else.
I really, really don't understand what's motivating your position. I'm trying!
> But really, I'm just rewriting the ideas of the consensus based notability guideline, which is much better written and specific: https://en.wikipedia.org/wiki/Wikipedia:Notability
That page is almost exclusively about defining notability (which, because of the intrinsic vagueness, necessarily takes a long time and is mostly unsuccessful). The only part that's directly about the reasons for the requirement is this subsection:
https://en.wikipedia.org/wiki/Wikipedia:Notability#Why_we_ha...
And the only argument it brings up that I didn't address is this: "We require multiple sources so that we can write a reasonably balanced article that complies with Wikipedia:Neutral point of view, rather than representing only one author's point of view." This, again, is something that can easily be addressed by just requiring verifiability to include coverage by multiple sources. (Even in highly notable articles, there are a large number of facts that are only verified through a single source; this isn't a reason to delete the fact.)