A popular band can, if there are good sources for the information. Regardless of what other policy exists, having written a number of band articles, I've found that to be more or less the one de-facto rule: cite thy sources, preferably to sources that seem relatively legit (musicological books or journal articles good; newspapers and magazines ok; the band's own website ok but not as the only source; "personal communication" not so good). Overall I think that makes sense, because it's the only real way of verifying that it's not just fans writing impossible-to-verify opinion or lore. Plus, Wikipedia is supposed to be a tertiary source that compiles secondary sources, which doesn't make any sense if there aren't secondary sources.
Whenever I've written articles about music groups that do have good references, I've never run into problems, even if they're obscure groups. For example, I recently wrote one on a minor 1980s punk band, with citations to the book American Hardcore (a history of 80s hardcore), which I doubt anybody would challenge. I do think there's an awkward gap around subjects that clearly should have secondary sources, but for some reason don't, because music historians and journalists have somehow neglected to write about them, or just haven't done it yet (musicology tends to lag). I can see why people get pissed off in those cases, but I do think it's basically no-win for Wikipedia, because in cases where good sources don't exist, it's not possible to produce an article up to what Wikipedia claims are its standards, a tertiary-literature article solidly referenced to the existing literature; because the problem is with the secondary literature itself being deficient (http://www.kmjn.org/notes/wikipedia_notability_verifiability...).
Nowadays I mostly do my Wikipedia-editing source-first: I find a good source or two about something, and then decide, hey, this is a good basis for a Wikipedia article. So for example, I'll pick up a book on the history of hip-hop, and use it to write articles about hip-hop musicians. Doing it that way, I have a remarkably laid-back, trouble-free Wikipedia-editing experience. It's still theoretically possible to read some policy pages in a way that could cause me problems: there might be some minor band that I've written a well-referenced article on, but is somehow still "too minor" to deserve a Wikipedia article under the Notability policies. But in practice, those objections almost never come up in the case of well-referenced articles; I think Verifiability basically trumps Notability these days, and that the deletionists who argued for a more strongly curated encyclopedia have lost that battle.
I think his point still stands - and this plays into the "systemic bias" point that other posters here have made. The issue here is not that citations are required (they ought to be, otherwise how can we ascertain truthfulness?), but rather it's heavily biased towards certain types of citations.
A poster mentioned elsewhere in this thread that Wikipedia's articles on animal husbandry are laughably incorrect, to the point where children can spot the errors. If someone knowledgeable in the field were to come in and try to correct this nonsense, what exactly would they cite?
Academic journals? Because information on animal husbandry is a frequent subject of academic debate. Newspapers and magazines? Surely a smash hit topic there.
This is why Wikipedia's quality is highly correlated to how well this subject is documented online. Physics, math, and computer science? These articles are top notch - because information is widely available online already, just begging for a Wikipedia editor to cite it.
Anything that isn't common online? Fuggetaboutit. Worse, anything that isn't the regular subject of newspapers and magazines?
Sure, people cite online stuff more, because people are lazy. But I haven't seen any bias against people who do cite books. That's mostly what I cite, since I write articles while I'm working my way through books, citing the book in the process. People seem to actually welcome it, if anything. I've added some information not previously available online that way about some archaeological sites, Greek wines, old AI systems, and a few other things. I've gotten only positive comments from doing that, which makes it extra-weird that people say Wikipedia is so unfriendly to contributors. No bureaucracy or acronyms or anything; just a few paragraphs with a citation to a book or two, click save, done.
Surely there must be books on animal husbandry that can be used to improve the articles? There has to be something, because I don't think Wikipedia should let you just cite "trust me, I know this". As a reader, I don't want to have to trust Wikipedia; I want Wikipedia to point me to somewhere where I can follow it up.
I do agree that there is a huge pile of stuff only covered in books that is under-covered on Wikipedia currently, due to nobody having gone to the library and dug up the information yet. It's got 3.8 million articles in English, but I think is not even halfway "done".
"But I haven't seen any bias against people who do cite books."
If you recall the great programming language AfD wars of recent. The problem was precisely that the editors exhibited an extraordinary bias against two things:
a) references of printed material -- because they didn't have a copy so they couldn't verify it, and/or the proceedings were not perceived to be notable enough on that particular editors radar to be counted
b) references of printed material in another language - as odd as it may seem, people who communicate in other languages do have something to say and produce material that can be referenced. But because the editor couldn't read that language, it was dismissed.
I'd believe what you posted, the trouble free utopian life of a contributor, maybe 5 years ago when one could actually contribute to WP without having all their changes reverted followed by snide comments from capricious editors. But the reality is that there are very large numbers of people who won't even be bothered contributing anymore (and you can see a fraction of a percent represented in the comments here) because the experience of doing so was shamefully poor.
If anything, I've found the experience has gotten better over the past few years, in that "notability" has been almost entirely trumped by "verifiability". These days, if I write an article with a few solid sources, I don't get hassled at all. I just wrote something a few days ago on an Ottoman-era castle in Greece, citing an offline (and not even very easy to get) book, and nobody hassled me.
I mean, you don't have to believe it, but I would guess that if you pick up a solid book, and write some well-referenced articles based on it, you aren't going to have problems either.
"If someone knowledgeable in the field were to come in and try to correct this nonsense, what exactly would they cite? Academic journals? Because information on animal husbandry is a frequent subject of academic debate. Newspapers and magazines? Surely a smash hit topic there."
I don't get your point. Of course there are academic journals on animal husbandry, as well as trade magazines and textbooks. Why would their be any difficulty finding material to cite on animal husbandry?
Whenever I've written articles about music groups that do have good references, I've never run into problems, even if they're obscure groups. For example, I recently wrote one on a minor 1980s punk band, with citations to the book American Hardcore (a history of 80s hardcore), which I doubt anybody would challenge. I do think there's an awkward gap around subjects that clearly should have secondary sources, but for some reason don't, because music historians and journalists have somehow neglected to write about them, or just haven't done it yet (musicology tends to lag). I can see why people get pissed off in those cases, but I do think it's basically no-win for Wikipedia, because in cases where good sources don't exist, it's not possible to produce an article up to what Wikipedia claims are its standards, a tertiary-literature article solidly referenced to the existing literature; because the problem is with the secondary literature itself being deficient (http://www.kmjn.org/notes/wikipedia_notability_verifiability...).
Nowadays I mostly do my Wikipedia-editing source-first: I find a good source or two about something, and then decide, hey, this is a good basis for a Wikipedia article. So for example, I'll pick up a book on the history of hip-hop, and use it to write articles about hip-hop musicians. Doing it that way, I have a remarkably laid-back, trouble-free Wikipedia-editing experience. It's still theoretically possible to read some policy pages in a way that could cause me problems: there might be some minor band that I've written a well-referenced article on, but is somehow still "too minor" to deserve a Wikipedia article under the Notability policies. But in practice, those objections almost never come up in the case of well-referenced articles; I think Verifiability basically trumps Notability these days, and that the deletionists who argued for a more strongly curated encyclopedia have lost that battle.