[quote name='4-string-thing' timestamp='1432987942' post='2786800']
I think I'll see how it goes on Sunday, there are will be at least 3 more 3 hour rehearsals before the gig, still time to bale out of it.
[/quote]
9 hours rehearsing 8 covers. I'd have walked already!
Seriously though, it might just be a sad occurrence that he's incapable of remembering stuff, nobody's fault, but I'd keep the band as a 'hobby' if thou feel that you owe them something, but if I were in your situation I'd never gig that lineup. Might be worth hanging on to see if you get a second guitatisr/singer into the fold, then slowly jettison the dead wood.
Maybe one day he'll forget that he's in a band - problem solved .