I answered a simple "no" but I suppose I could let a jazz band get away with it.
Pit orchestras aren't on stage so they don't count. They're in the pit for a reason.
But if you play in a pop/rock/variety/top 20/soul/funk/R&B band with a music stand you may as well go ahead and slap on some shorts, sandals with black socks or bleach white snaekers, stupid backwards beany hat, and every other awful old unprofessional bass player stereotype while you're at it. It's just awful.
If you don't have time enough or talent enough to learn the songs then (my opinion of course) you don't have time or talent enough to be on stage.
If I ever paid a cover charge and walked in to see some guy dressed like he would on Saturday morning looking through his reading glasses at a music stand I would want my money back so I could go see a band that gives a crap.
If I am going to pay you, you should be special. You should LOOK dideferential than anyone I'm the audience. And you should be talented enough to warrant being paid..... which means you know the songs BEFORE you show up.
I play only fill in gigs these days. I may play 20 songs in a given show I have never preformed live before. I do keep a chart book just in casE I have a brain far (or the band surprises me with an "alternative arrangement "). But it stays on the floor behind my wedge monitor and the majority of the crowd doesn't ever know it's there. I turn the page with the tip of my shoes.
But if I were a member of a band you can believe there would be no stupid beany hats and no music stands.