What can an encyclopedia say about a band that has a website and a Spotify page, but isn't big enough to attract attention from the press or music critics? We can certainly say that they are a band, anyone can see that. We can say they have 10,000 plays on Spotify, and list their current members. Maybe we can dig up a newspaper article saying that they performed someplace. But beyond that, what is there? They've probably got a biography on their website, but it's in no way verifiable, and the only person required to believe it is the guy putting it on the Wikipedia page. Everyone after that will read it on Wikipedia and assume it's 95% likely to be true. And so on. We're left with barebones facts that are of no help to anyone looking for reliable information about the band. All of this applies equally well to little-known authors, random Indian corporations, and your cat. 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?
When notability is assessed, don't think "is this topic something that will be googled by someone looking for more information?" Think about the role of Wikipedia and what we can offer by providing an overview and references to secondary sources. The notability guidelines are about ensuring that there is a baseline of quality facts that we can provide to readers.
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