On being a MUSICIAN
I'm really surprised at you kids. I thought sax players were more civilized, and certainly thought they knew the basics of musicianship.
The solution is to request the guitarists to play in F. It is that simple. Bass players shouldn't have any trouble with this, and guitarists can always capo first fret (if they are that novice, they will have a capo)
Better still, get them to play in G-minor pentatonic, it is a very cool blues key, easy as pie to play on the guitar (first and third frets only, plus open strings) and if you educate them about Muddy Waters (esp "Electric Mud") or Howlin' Wolf, you can get a lot of mileage out of that key. If you want to make
your life easier, you can ask them to play in C, only you play in C minor pentatonic, very bluesy, you can do all the pyrotechnics that will blow their minds and for you, it's Eb, couldn't be easier.
And if you are truly
stuck playing E and A, it's not the end of the world; you're the musician, be musical, search for enharmonic keys, simplify your playing, go meltdown nuclear on the side keys, become possessed, roll your eyes back in your head and
wail ... either they will dig it and you're hired, or you will freak them out completely and they'll shift to F and G just to keep you clamped down

... seriously, tho, if you learn your basic blues scales in C# and F#, then pick your spots and play them. Remember Neil Young's "Cinnamon Girl": the guitar solo is pure classic raw feel, but it is one note.
But most of all, if anyone shows up with ANY kind of instrument, if you consider them less than you because "
He can't be a man 'cause he doesn't smoke the same cigarettes as me" then you disgrace the trade by your bigotry. Musicians have the sacred duty to hold the people
together, ours is the job of
social cohesion -- The name of the game is music, and music is about harmony and working together to make the Joyful Noise.