Great response, and I largely agree, but let me play devil's advocate for a moment:
If you were responding to a bass player audition ad for a band that, for whatever crazy reason, was asking candidates to come in knowing 10 songs, and it was a project you were otherwise highly interested in and motivated by, and you knew the stiff competition for the slot had several other competent bass players willingly learning those 10 songs...
...would you learn them? Or, as a matter of principle, would you surmise the organizers of this project, no matter how attractive, are asshats for requesting so many songs at an audition and pass on the whole thing?
Thank you! Fair question. It's my firm belief that no credible band would handle it that way *for a first audition* unless it was made clear why they were doing so and it was for good reason(s). My caveats above would likely apply, then yes of course I'd gladly do it.
I'd even learn more songs of theirs if I know what they are and can manage it in time. I agree with that philosophy, as well as with the idea of nailing a few songs vs. half-assing many if that's the choice you must make.
Even if not getting the gig, you'd prove to those involved you can do it and they may call you or recommend you for other gigs or you may hire some of them for gigs someday. Plenty of ways to turn it into a win, so exchange contact info with the cats you gel with because the truth is
you're auditioning them too.
I do recall one gig I auditioned for that was well worth it. Extremely demanding BL and I was way in over my head. I didn't get the gig but we stayed in touch and once I was on that level I wound up gigging with him and it was a blast, I learned and developed a lot, met stellar players, and got paid well. We're mates to this day.
I would not do it however if we couldn't have a dialogue first to determine why it's necessary to do it that way - in other words what's the real deal and what's in it for me - and if it's not clear I'll live happily with my existing gigs.
Want a reliable quality person on your team? At least have 5 minutes to discuss what's up. It's in your own best interests to filter out poor candidates or a poor fit long before meeting in person.
Gotta treat people the way you'd want to be treated, and I don't know any pros that conduct things under some shroud of secrecy like they're Yoda or Mr. Miyagi. I fully respect if they can't and won't name the artist or certain details for discretionary reasons if it's a high-profile gig. But I have to have enough faith in them and their credits to believe they're not wasting their own time much less mine. There should still be fundamental details available in any case in advance.