I don't have anything useful to add, I just want to pile on.
About 20 years ago I was in an original band and we lost our singer after our debut gig. His ego was just too huge and fragile, and the guitarist, drummer, and I were being too aggressive, too flashy, and basically too kick-ass of a band for him to front us. I say that with tongue in cheek -- it just seemed like he wanted us to vanish into some mist in the background and we were so jazzed to be playing that he couldn't handle us getting any attention.
So he quit at the end of the show. Incredible jerk.
Anyway, it being 1991 or so, we did what any band of that era would do and put an ad in the paper and little ads in music stores. We got 118 people (by the guitar player's count) who responded to the ad. Of those 118 we got to the audition stage with about 40 of them. One very memorable weekend, we had about 12 of those folks show up in a row as we got the whole thing rolling. The three-ring circus that ensued was astonishing.
Some people showed up with nothing, no ability to sing, no songs memorized, nothing. We were playing originals so we gave them tapes and words and they'd come back with nothing, nothing, and nothing.
I remember distinctly, though, four of the auditions that were PAINFULLY memorable. One girl showed up with a little keyboard and had learned our songs -- we sounded like a proto-grunge band with a lot of progressive rock/jazz influence thrown in. So imagine this thumping driving beat with a girl singing like Pat Benetar. No kidding. She did a great job of technically singing, but her style was cracking us up, and she would motion with her hands and everything. Clearly a case of a lot of effort put into being not quite what we were after.
Another dude came with a microphone stand and sang our stuff (again, pretty good) but he did it in the style of Robert Plant, and I mean he also acted out his whole part. Interesting yes but very derivative and just too hilarious for us to consider going on stage with someone like that.
Another guy came who had a completely original style but brought HIS WHOLE BAND with him, and almost acted like he was auditioning US. We ended that one pretty quick. We jammed with them and then let them get their keyboards and guitars and **** and leave.
Finally, a dude came who didn't know OUR songs but he'd learned some Nirvana covers, so I was introduced to Nirvana and auditioned a singer on "Come as you are" all at once (I seriously hadn't even heard of them until that day).
That was just SOME of the circus show we endured. I don't remember most of the rest, but I do remember my guitarist telling me that he had talked to 118 people who had responded to the ad.
The punchline is, we ended up sharing vocal duties between myself and the guitarist.