Herb, we handled that much the same way. "We don't do that one, but I think you will like the one we do for you instead."
I have met many musicians who see it as a badge of courage somehow to brag that they know 8,293 songs. My first question (that I say to myself because I really don't care how many songs you know) is "You do 45 a night, and in a different place every night. Why do you carry that kind of luggage with you? And the second question is "With that much material, unless you rehearse 29 hours a day, every day, you can never rehearse them. You DO need to touch a song in the rehearsal hall if you are going to play it." Which then leads me to "But I know you never rehearse. You don't even play with the same people every show. Which is why you only know that same 50 songs every band in town knows."
But it's not my concern if you know the Famous 50 or the 8,293.
The only thing that used to get me angry is when some drunken idiot would come to the stage in the middle of the 3rd set of MOTOWN MUSIC and start yelling "Skynaaaaaaard!!" I actually had people removed by security a couple of times for that. Don't disrupt what we are doing. Stay on the floor where you belong. If you want to hear Skynaaaaaaard, join a band and play it. Oh, that's right. You have no talent and don't play or sing....
I just can't imagine needing 550 songs, Notes, but I don't really know what you do. If you are playing a prom tonight, a wedding tomorrow, a bar the next night and then a show for geezers at an old folks home, I would imagine you need to know both Uptown Funk and String Of Pearls. Plus you are a "captive" band. With you and your wife, you are always available to practice, learn.... It's different with an 8 piece band of players with kids who have to be dropping them off at soccer or the swim meet.
Starting to see why I don't play anymore? LOL!!