At one point, I had more than 3,000 songs in my repertoire - no way possible to remember all those lyrics. Yes, a lot of them were in my aging brain, but sometimes, ya just need help. I seriously doubt that Sinatra could remember all the words to ALL the songs he performed over the years, even those that were top hits and he performed thousands of times. I can clearly remember the last time he did My Way and blew the lyrics, but managed to muddle his way through the show with a standing ovation.
As for the songs, well, I'm just an old country boy, so more than 3 chords was pretty much unusual, but sometimes I had to use up to 4 or more - Scary!

Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)