Joe, after you play those songs long enough, depending on how well you retain things (and that is VERY different for everybody) you will know them soon enough. Unlike Notes huge catalog, which they need because of the varied places they played, I was always in bands that had maybe 60 active songs at a time. And when we learned a new one, an old one went out. 3 sets, 13 songs each. Those sets would have a solid 10 that were there every night, and 3 variables we plugged in. We ran things different than a lot of bands. If we had a gig Thursday night, we had our sets on Wednesday so if there was a guitar change needed or a sample I had to load from a disc, I could make a note on the set that the change was coming. Very little down time between songs. In fact the 2nd set was 60 minutes that did not stop. But again, different situations.

A song you play once a year is different from a song you play 5 nights a week.